# APPENDIX G

QuestionsandAnswerson: Antidegradation

WATER 

# QUALITY STANDARDS HANDBOOK

SECONDEDITIONUnited States Environmental Protection Agency Office of Water Regulations and Standards Washington. DC 20460 August 1965

Water 

# Questions & Answers on: 

# AntidegradationQUESTIONS AND ANSWERS ONANTIDEGRADATION

INTRODUCTION

This document provides guidance on the antidegradation policy component of water quality standards and its application. The document begins with the text of the policy as stated in the water quality standards regulation, 40 CFR 131.12 (40 FR 51400, November 8, 1983), the portion of the Preamble discussing the antidegradation policy, and the response to comments generated during the public comment period on the regulation.

The document then uses a question and answer format to present information about the origin of the policy, the meaning of various terms, and its application in both general terms and in specific examples. A number of the questions and answers are closely related; the reader is advised to consider the document in its entirety, for a maximum understanding of the policy, rather than to focus on particular
answers in isolation. While this document obviously does not address every question which could arise concerning the policy, we hope that the principles it sets out will aid the reader in applying the policy in other situations. Additional guidance will be developed concerning the application of the antidegradation policy as it affects pollution from nonpoint
sources. Since Congress is actively considering amending the Clean Water Act to provide additional programs for the control of nonpoint sources, EPA will await the outcome of congressional action before proceeding further.

EPA also has available, for public information, a summary of each State's antidegradation policy. For historical interest, limited copies are available of a Compendium of Department of the Interior Statements on Non-Degradation of Interstate Waters, August, 1968. Information on any aspect of the water quality standards program and copies of these documents may be obtained from:

David Sabock, Chief Standards Branch (WH-585) Office of Water Regulations and Standards Environmental Protect ion Agency 401 M. Street, S.W. Washington, D.C. 20460

This document is designated as Appendix A to Chapter 2 - General Program Guidance (antidegradation) of the Water Quality Standards Handbook, December 1983.

James M. Conlon, Acting Director Office of Water Regulations and StandardsREGULATION

Federal Register / Vol. 48, No. 217 / Tuesday, November 8,1983 / Rules and Regulations 51407

§131.12Antidegradation policy. (a) The State shall develop and adopt

astatewide antidegradation policy and identify the methods for implementing such policy pursuant to this subpart. The antidegradation policy and implementation methods shall, ata minimum, be consistent with the following: (1) Existing instream water uses and the level of water quality necessary to protect the existing uses shall be maintained and protected.

(2) Where the quality of the waters exceedlevelsnecessary to support propagation of fish, shellfish, and wildlife and recreation in and on the water, thatqualityshallbe maintained and protected unless the State finds. offer full satisfaction of the intergovernmental coordination and publicparticipation provisions of the State continuing planning process, that allowing lower wafer quality is necessary to accommodate important economic or social development in the

area in which the waters are located. In allowing such degradation or lower water quality, the State shall assure water quality adequate to protect existing uses fully. Further, the State shall assure that there shall be achieved the highest statutory and regulatory requirements for all new and existing point sources and all cost-effective and reasonable best management practices for nonpoint source control. (3) Where high quality waters constitute an outstanding National

resource. such as waters of National and State parks end wildlife refuges and waters of exceptional recreational or ecological significance, that water quality shall be maintained and protected. (4) In those cases where potential water quality impairment associated with athermal discharge is involved, the antidegradation policy and implementing method shall be consistent with section 316 of the Act.

iPREAMBLE

51402 Federal Register / Vol. 48. No. 217 / Tuesday, November 8, 1983 / RulesandRegulations

Antidegradation Policy
The preamble totheproposed rule discussed three options forchanging the existing antidegradation policy. Option 1,theproposed option, provided simply that usesattained would bemaintained. Option 2stated that notonly would uses attained bemaintained but that high quality waters, i.e.waters with quality better than that needed toprotect fish andwildlife. would bemaintained (that is,theexisting antidegradation policy minus the “outstanding natural resource waters” provision). Option 3would have allowed changes inanexisting useif maintaining that usewould effectively prevent any future growth inthe community orifthebenefits of maintaining theuse donot bear a reasonable relationship tothecosts. Although there was support for Option 2,there was greeter support for retaining thefull existing policy. including theprovision onoutstanding National resource waters. Therefore, EPA hasretained theexisting antidegradation policy (Section 131.12) because itmore accurately reflects the degree ofwater quality protection desired by the public, and isconsistent with thegoals and purposes ortheAct. Inretaining the policy EPA made four changes. First, theprovisions on maintaining and protecting existing instream usesand high quality waters
were retained, but thesentences stating that nofurther water quality degradation which would interfere with

orbecome injurious toexisting instream
usesis lowed were deleted. The deletions were made because theterms interfere” and “injurious” were subject misinterpretation asprecluding any activity which might even momentarily addpollutants tothewater.Moreover,
webelievethe

deletedsentence was intended merelyasa restatement ofthe basic policy. Since therewritten provision,with theaddition ofaphrase
onwater quality described inthenext sentence. stands alone asexpressing the basic thrust and intent ofthe antidegradation policy, we deleted the confusing phrases. Second, in §131.12(a)(1)aphrase war added requiring that thelevel ofwater quality necessary toprotect enexisting usebe maintained and protected. The previous policy required only that anexisting use bemaintained. In§ 131.12(a)(2)aphrase
was added that “In allowing such degradation orlower water quality. the State shall assure water quality adequate toprotect existing usesfully”. This means that thefull usemust continue toexist even ifsome change in water quality may bepermitted. Third, inthefirst sentence of§ 131.12(a)(2)the wording was changed from “.

.. significant economic orsocial development.

. .”to".

..important economic orsocial development.

. .” Inthecontext ofthe antidegradation policy theword important” strengthens the intent ofprotecting higher quality waters. Although common usage ofthe words may imply otherwise, thecorrect definitions ofthetwo terms indicate that thegreater degree ofenvironmental protection isafforded by theword “important.” Fourth,§ 131.12(a)(3)dealing with the designation ofoutstanding National
resource waters [ONRW] was changed toprovidea limited exception tothe absolute “no degradation” requirement. EPA was concerned that waters which properly could have been designated as ONRW were not being sodesignated because oftheflat nodegradation provision, and therefore were not being given special protection. The no degradation provision was sometimes interpreted asprohibiting any activity (Including temporary orshort-term) from being conducted. States may allow some

limitedactivities which result in temporary and short-term changes in water quality. Suchactivities are considered tobeconsistent with the intentand purpose ofanONRW. Therefore, EPA has rewritten the provision toread “.

.. that water quality shallbe maintained and protected, and removed thephrase “No degradation shall beallowed.

..”

ii Initsentirety. theantidegradation policy represents athree-tiered approach tomaintaining and protecting various levels ofwater quality and uses. At its base (Section 131.12(a)(1)), all existing usesand thelevel ofwater

quality necessary toprotect thoseuses must bemaintained and protected. This provision establishes theabsolute floor ofwater quality inall waters ofthe United States. The second level (Section 131.12(a)(2)) provides protection of actual water quality inareas where the quality ofthewaters exceed levels necessary tosupport propagation offish, shellfish, andwildlife and recreation in andonthewater (“fishable/ swimmable”). There are provisions contained inthis subsection toallow
some limited water quality degradation after extensive public involvement, as long asthewater quality remains adequate tobe“fishable/swimmable.” Finally§ 131.23(a)(3) provides special protection ofwaters forwhich the ordinary useclassifications and water quality criteria donotsuffice. denoted “outstanding National resource water.” Ordinarily most people view this subsection asprotecting and maintaining the highest quality waters oftheUnited States: that isclearly the thrust ofthe provision. Itdoes, however, also offer special protection forwaters of“ecological significance.” These are water bodies which are Important. unique. orsensitive ecologically. but whose water quality asmeasured by the traditional parameters (dissolved oxygen, pH, etc.) may not beparticularly high orwhose character cannot he adequately described by these parameters.RESPONSE To PUBLIC CCMMENTS

Fodenl Register / Vol. 48, No. 217/ Tuesday. November a 1963 / Rules anJ Regulattonr 51409

Antidegradation Policy
EPA’@ proporal. which would have limited theantidegradation polky tothe maintenance ofexisting uses.plur three alternative policy statements described in the preamble IOthe proposal notice, Renerated extensive public comment. EPA’s rc*sponre is described in the Preaml~le to this finnl rule and includer

arespunse to both the rubrtantive and philosophical commentr offered. Public comments overwhelmingly supported ret(*ntion of the existing policy and EPA did so in the final rule. EPA’s response to several commente dealing with the antidegradation policy. which were not discussed In the Preamble apI dimcursed below. Option three contained in the wncy’r proposal would have allowed the porribility of exceptions to maintaining exirting user. This option

was either criticized for being illegal or
was rupported because it provided additional flexibility for economic growth. The latter commenterr believed that allowancea should bemade for carefully defined cxccptionr IOthe abrolute rc?quirement that uses attallied murt be maintained. EPA rejects this contention aa being totally inconsistent with the spirit and intent of both the Clean Waler Act and the underlying philoeophy of the antidegradation policy. Moreover, although the Agency rpecifically asked for examples of where the existing antidegradation policy had precluded growth. no exampler were provided. Therefore. wholly apart from technical legal

concerns. there appear-e to be no iurtification for adopting Option 3. Mart critics otthe proporeo antidegradation policy objected to removing the public’r ability IOaffect decirionr on high quality watcn and outstanding national reeource waten. In attempting to explaln how the propored antidegradation policy would be implemented, the Preamble to the propored rule stated that no public participation would be neceuary in certain inrtancea because nochange

was being mude inaState-r water quality standard. Although that statement wus technically accurate. it left the mistaken impression that all public pcirticipotion was removed from the disrllssionr on high quality waters end that 1snut correct. A NPDEZS permit would hvve to be issued ora200plan amendf:d for nny de:crioration in wtrtcr quality to be “allowed”. Both actions require notice and an opportunity for public comment. tlowever. EPA retained the existing policy so this issue in moot. Other changer in the policy affecting ONRW an’ discussed inthe Preamble.

iiiOUESTIONSANDANSWERSON ANTIDEGRADATION

1. WHATIS THEORIGIN OFTHEANTIDEGRADATION POLICY?

The basic policy was established on February 8, 1968, by the Secretary of the U.S. Department of the Interior. It

was included in EPA's first water quality standards regulation 40 CFR 130.17, 40 FR 55340-41, November 28, 1975. It was slightly refined and repromulgated as part of the current program regulation published on November 8, 1983 (48 FR 51400, 40 CFRS131.12). An ant idegradation policy is one of the minimum elements required to be included in a State's
water quality standards.

2. WHEREIN THE CLEANWATERACT (CWA) IS THEREA REOUIREHENTFORAN ANTIDEGRADATION POLICY ORSUCHA POLICY EXPRESSED?

There is no explicit requirement for such a policy in the Act. However, the policy is consistent with the spirit, intent, and goals of the Act, especially the clause "... restore and maintain the chemical, physical and biological integrity of the Nation's waters" (SlOl(a)) and arguably is covered by the provision of 303(a) which made water quality standard requirements under prior law the "starting point" for CWAwater quality requirements.

3. CANA STATE JUSTIFY NOTHAVING ANANTIDEGRADATION POLICY IN ITS WATEROUALITY STANDARDS?

EPA's water quality standards regulation requires each State to adopt an antidegradation policy and specifies the minimum requirements for a policy. If not included in the standards regulation of a State, the policy must be specifically referenced in the water quality standards so that the functional relationship between the policy and the standards is clear. Regardless of the location of the policy, it must meet all applicable requirements.

4. WHATHAPPENSIF A STATE'S ANTIDEGRADATION POLICY DOESNOT MEETTHE REGULATORYREQUIREMENTS?

If this occurs either through State action to revise its policy or through revised Federal requirements, the State would be given an opportunity to make its policy consistent with the regulation. If this is not done, EPA has the authority to promulgate the policy for the State pursuant to Section 303(c)(4) of the Clean Water Act.

-l-5. WHATCOULD HAPPEN IF A STATE FAILED TO IMPLEMENT ITS ANTIDEGRADATION POLICY PROPERLY?

If a State issues an NPDESpermit which violates the required antidegradation policy, it would be subject to a discretionary EPAveto under Section 402(d) or to a citizen challenge. In addition to actions on permits, any wasteload allocations and total maximum daily loads violating the antidegradation policy are subject to EPAdisapproval and EPA promulgation of a new wasteload allocation/total maximum daily load under Section 303(d) of the Act. If a significant pattern of violation was evident, EPAcould constrain the award of grants or possibly revoke any Federal permitting capability that had been delegated to the State. If the State issues a S401 certification (for an EPA-issued NPDES permit) which fails to reflect the requirements of the antidegradation policy, EPAwill, on its own initiative, add any additional or more stringent effluent limitations required to ensure compliance with Section 301(b)(l)(C). If the faulty S401 certification related to permits issued by other Federal agencies (e.g. a Corp of Engineers Section 404 permit), EPAcould comment unfavorably upon permit issuance. The public, of course, could bring pressure upon the permit issuing agency.

6. 1JILL THEAPPLICATION OFTHEANTIDEGRADATION POLICY ADVERSELY IMPACT ECONOMICDEVELOPMENT?

This concern has been raised since the inception of the antidegradation policy. The answer remains the same. The policy has been carefully structured to minimize adverse effects on economic development while protecting the water quality goals of the Act. As Secretary Udall put it in 1968, the policy serves "... the dual purpose of carrying out the letter and spirit of the Act without interfering unduly with further economic development" (Secretary Udall, February 8, 1968). Application of the policy could affect the levels and/or kinds of waste treatment necessary or result in the

use of alternate sites where the environmental impact would
be less damaging. These effects could have economic implications as do all other environmental controls.

7. \aAT IS THE PROPERINTERPRETATION OFTHETERM"AN EXISTING USE"?

An existing use can be established by demonstrating that fishing, swimming, or other uses have actually occurred since November 28, 1975, or that the water quality is suitable to allow such uses tooccur (unless there are physical problems which prevent the use regardless of water quality). An example of the latter is an area where shellfish are propagating and surviving in a biologically suitable habitat and are available and suitable for harvesting. Such facts clearly establish that shellfish harvesting is
an "existing" use, not one dependent oh improvements in water quality. To argue otherwise would be to say that

-2-the only time an aquatic protection use "exists" is if someone

succeeds in catching fish.

8. THE WATER QUALITY STANDARDS REGULATION STATES THAT "EXISTING USES ANDTHE LEVEL OF WATER QUALITY NECESSARY TO PROTECT THE EXISTING USES SHALL BE MAINTAINED AND PHOTECTED." HOWFULLY AND AT WHAT LEVEL OF PROTECTION IS AN EXISTING USE TO BE PROTECTED IN ORDERTOSATISFY THEABOVEREOUIREMENT?

NOactivity is allowable under the antidegradation policy which would partially or completely eliminate any existing
use whether or not that use is designated in a State's water quality standards. The aquatic protection use is a broad category requiring further explanation. Species that are in the water body and which are consistent with the designated-&e (i.e., not aberrational) must be protected, even if not prevalent in number or importance. Nor can activity be allowed which would render the species unfit for maintaining the use. Water quality should be such that it results in no mortality and
no significant growth or reproductive impairment of resident species. (See Question 16 for situation where an aberrant sensitive species may exist.) Any lowering of water quality below this full level of protection is not allowed. A State may develop subcategories of aquatic protection uses but cannot choose different levels of protection for like uses. The fact that sport or commercial fish are not present does not mean that the water may not be supporting an aquatic life protection function. An existing aquatic community composed entirely of invertebrates and plants, such as may be found in a pristine alpine tributary stream, should still be protected whether or not such a stream supports a fishery. Even though the shorthand expression "fishable/swimmable" is often used, the actual objective of the act is to "restore and maintain the chemical, physical, and biological integrity of our Nation's waters (section lOl(a)).l/ The term "aquatic life" would more accurately reflect the protection of the squat ic community that was intended in Section 101(a)(2) of the Act.

9. IS THERE ANY SITUATION WHEREAN EXISTING USECANBE REfIOVED?

In general, no. Water quality may sometimes be affected, but an existing use, and the level of water quality to protect it must be maintained (S131.12(a)(l) and (2) of the regulation). However, the State may limit or not designate such a use if the reason for such action is non-water quality related. For example, a State may wish to impose a temporary shellfishing ban to prevent overharvesting and ensure an abundant population over the long run, or may wish to restrict swimming from heavily trafficked areas. If the State chooses,
='/ Note: "Fishable/swimmable" is a term of convenience used in

- the standards program in lieu of constantly repeating

the entire text of Section 101(a)(2) goal of the Clean Water Act. As a short-hand expression it is potentially misleading.

-3-for non-water quality reasons, to linlit use designations,

it must still adopt criteria to protect the use if there is

a reasonable likelihood it will actually occur (e.g. swimming in a prohibited water). However, if the State's action is based on a recognition that water quality is likely to be lowered to the point that it no longer is sufficient to protect and maintain an existing use, then such action is inconsistent with the antidegradation policy.

10. HOW DOESTHE REQUIREMENTTHAT THE LEVEL OFWATERQUALITY NECESSARYTO PROTECTTHE EXISTING USE(S) BE MAINTAINED AND PROTECTED, WHICHAPPEARSIN S131.12(a)(l),(2), AND (3) OFTHEWATERQUALITY STANDARDSREGULATION, ACTUALLY WORK?

Section 131.12(a)(l), as described in the Preamble to the regulation, provides the absolute floor of water quality in all waters of the United States. This paragraph applies a minimum level of protection to all waters. However, it is
most pertinent to waters having beneficial uses that are less than the Section 101(a)(2) goals of the Act. If it can be provent in that situation, that water quality exceeds that necessary to fully protect the existing use(s) and exceeds water quality standards but is not of sufficient quality to cause a better use to be achieved, then that water quality may be lowered to the level required to fully protect the existing use as long as existing water quality standards and downstream water quality standards are not affected. If this does not involve a change in standards,
no public hearing would be required under Section 303(c). However, public participation would still be provided in connection with the issuance of a NPDESpermit or amendment of a 208 plan. If, however, analysis indicates that the higher water quality does result in a better use, even if not up to the Section 101(a)(2) goals, then the water quality standards must be upgraded to reflect the uses presently being attained (S131.1O(i)).

Section 131.12(a)(2) applies to waters whose quality exceeds that necessary to protect the Section 101(a)(2) goals of the Act. In this case, water quality may not be lowered to less than the level necessary to fully protect the "fishable /swimmable" uses and other existing uses and may be lowered even to those levels only after following all the provisions described in S131.12(a)(2). This requirement applies to individual water quality parameters.

Section 131.12(a)(3) applies to so-called outstanding National Resource (ONRW)waters where the ordinary use classifications and supporting criteria are not appropriate. As described in the Preamble to the water quality standards regulation "States
may allow some limited activities which result in temporary and short-term changes in water quality," but such changes in water quality should not alter the essential character or special use which makes the water an ONRW. (See also pages 2-14,- 15 of the Water Quality Standards Handbook.)
Any one or a combination of several activities may trigger the antidegradatioq pc! icy analysis as discussed above. such activities include a scheduled water quality standards review,

-4-the establishment of new or revised wasteload allocations

NPDESpermits, the demonstration of need for advanced treatment
or request by private or public agencies or individuals for a special study of the water body.

11. WILL ANACTIVITY WHICHWILL DEGRADEWATERQUALITY, ANDPRECLUDE AN EXISTING USE IN ONLYA PORTION OF A WATERBODY (BUT ALLOWIT TO REMAIN IN OTHERPARTSOFTHE WATERBODY) SATISFY THEANTIDEGRADATION REQUIREMENTTHAT EXISTING USESSHALL BE MAINTAINED ANDPROTECTED?

No. Existing uses must be maintained in all parts of the water body segment in question other thanin restricted mixing zones. For example, an activity which lowers water quality such that a buffer zone must be established within a previous shellfish harvesting area is inconsistent with the antidegradation policy. (However, a slightly different approach is taken for fills in wetlands, as explained in Question 13.)

12. DOESANTIDEGRADATION APPLY TO POTENTIAL USES?

No. The focus of the antidegradation policy is on protecting existing uses. Of course, insofar as existing uses and water quality are protected and maintained by the policy the eventual improvement of water quality and attainment of
new uses may be facilitated. The use attainability requirements of S131.10 also help ensure that attainable potential

uses are actually attained. (See also questions 7 and 10.)

13. FILL OPERATIONS IN WETLANDSAUTOMATICALLY ELIMINATE ANY EXISTING USE IN THE FILLED AREA. HOWIS THEANTIDEGRADATION POLICY APPLIED IN THAT SITUATION?

Since a literal interpretation of the antidegradation policy could result in preventing the issuance of any wetland fill permit under Section 404 of the Clean Water Act, and it is logical to assume that Congress intended some such permits to be granted within the framework of the Act, EPA interprets s131.12 (a)(l) of the antidegradation policy to be satisfied with regard to fills in wetlands if the discharge did not result in "significant degradation" to the aquatic ecosystem
as defined under Section 230.10(c) of the Section 404(b)(l) guidelines. If any wetlands were found to have better water quality than "fishable/ swimmable", the State would be allowed to lower water quality to the no significant degradation level as long as the requirements of Section 131.12(a)(2) were followed. As for the ONRWprovision of antidegradation (131.(a)(2)(3)), there is no difference in the way it applies to wetlands and other water bodies.

-5-14. Is POLLUTION RESULTING FROMNONPOINTSOURCEACTIVITIES SUBJECT

TO PROVISIONS 3F THEANTIDEGRADATION POLICY? gonpoint source activities am3 not exempt from the provisions of the antidegradation policy. The language of Section 131.12 (a)(2) of the regulation: "Further, the State shall assure that there shall be achieved the highest statutory and regulatory requirements for all new and existing point sources and all cost-effective and reasonable best nangement practices for nonpoint source control" reflects statutory provisiona of the Clean Water Act. While it is true that the Act does not establish a regulatory program for nOnpOint sources, it clearly intends that the BMPsdeveloped and approved under sections 205(j), 208 and 303(e) be agressively implemented by the States. As indicated in the introduction, EPAwill be developing additional guidance in this area.

15. IN HIGH QUALITY WATERS,ARE NEWDISCHARGERSOREXPANSIONOF EXISTING FACILITIES SUBJECTTOTHE PROVISIONS OFANTIDEGRADATION?

Yes. Since such activities would presumably lower water quality, they would not be permissible unless the State finds that it is necessary to accommodate important economic or social developmer,t (Section 131.12(a)(2). In addition the minimum technology base.3 requirements must be met, including new source performance standards. This standard would be implemented through the wast.eload and NPDESpermit process for such new or expanded source!;.

16. A STREAM, DESIGNATEDASA WARMWATERFISHERY, HASBEEN FOUNDTO CONTAIN A SMALL, APPARENTLYNATURALLYOCCURRINGPOPULATIO!J OFA COLD-WATERGAMEFISH. THESE FISH APPEARTOHAVEADAPTEDTO THE NATURALWARMWATERTEMPERATURESOFTHE STREAMWHICHWOULDNOT NORMALLYALLOWTHEIR GROWTH ANDREPRODUCTION. WHATIS THE EXISTING USEWHICHMUSTBE PROTECTEDUNDERSECTION 131.12(a)(l)?

Section 131.12(a)(l) states that "Existing instream water uses and level of water quality necessary to protect the existing uses shall be maintained and protected.* While sustaining a small cold-water fish population, the stream does not support an existing use of a "cold-water fishery.* The existing stream temperatures are unsuitable for a thrivil~g cold-water fishery. The snail marginal population is an artifact and should not be employed to mandate a more stringent

use (true cold-water fishery) where natural conditions are not suitable for that use.
.4use attainability analysis or other scientific assessmc?nt should be used to determine whether the aquatic life population is in fact an artifact or is a stable population requiring

-6-water quality protection. Where species appear in areas not

normally expected, some adaptation may have occurred and sitespecific criteria may be appropriately developed. should the cold-water fish population consist of a threatened or endangered species, it may require protection under the Endangered Species Act. Otherwise the stream need only be protected as a warm water fishery.

17. HOWDOESEPA'S ANTIDEGRADATION POLICY APPLY TOA kJATERBODY \JHEREA CHANGEIN MAN'S ACTIVITIES IN ORAROUNDTHAT kJATERBODY WILL PRECLUDEAN EXISTING USE FROMBEING FULLY MAINTAINED?

If a planned activity will forseeably lower water quality to the extent that it no longer is sufficient to protect and maintain the existing uses in that waterbody, such an activity is inconsistent with EPA's antidegradation policy which requires that existing uses are to be maintained. In such a circumstance the planned activity must be avoided or adequate mitigation or preventive measures must be taken to

ensure that the existing uses and the water quality to protect them will be maintained.

In addition, in "high quality waters", under S131.12(a)(2), before any lowering of water quality occurs, there must be: 1) a finding that it is necessary in order to accommodate important economical or social development in the area in which the waters are located, (2) full satisfaction of all intergovernmental coordination and public participation provisions and (3) assurance that the highest statutory and regulatory requirements and best management practices for pollutant controls are achieved. This provision can normally
be satisfied by the completion of llater Quality Yanagement Plan updates or by a similar process that allows for public participation and intergovernmental coordination. This provision is intended to provide relief only in a few extraordinary circumstances where the economic and social need for the activity clearly outweiqhs the benefit of maintaining water quality above that required for "fishable/swimmable" water, and the two cannot both be achieved. The burden of demonstration on the individual proposinq such activity will be very high. In any case, moreover, the existing use must be maintained and the activity shall not preclude the maintenance of a "fishable/swimmable" level of water quality protection.

18. WHATDOESEPA MEANBY "

...THE STATE SHALL ENSURETHAT THERE SHALL BEACHIEVED THE HIGHEST STATUTORYAND REGULATORYREQUIREMENTS FORALL NEWAND EXISTING POINT SOURCESANDALL COSTEFFECTIVE ANDREASONABLEBEST MANAGEMENTPRACTICES FORNON-POINT SOURCE CONTROL" (S131.12(a)(2)?

This requirement ensures that the limited provision for lowering water quality of high quality waters down to "fishable /swimmable" levels will not be used to undercut the Clean Water Act requirements for point source and non-point
source pollution control. Furthermore, by ensuring compliance

-7-with such statutory and regulatory controls, there is less

chance that a lowering of water quality will be sought in order to accommodate new economic and social development.

19. WHATDOESEPAMEANBY "

...IMPORTANT ECONOMICORSOCIAL DEVELOPMENTIN THEAREA IN WHICHTHEWATERSARE LOCATED" IN 131.1 2(a)(2)?

This phrase is simply intended to convey a general concept regarding what level of social and economic development could be used to justify a change in high quality waters. Any more exact meaning will evolve through case-by-case application under the State's continuing planning process. Although EPA has issued suggestions on what might be considered in determining economic or social impacts, the Agency has no predetermined level of activity that is defined as "important".

20. IF A WATERBODYWITH A PUBLIC WATERSUPPLY DESIGNATED USE IS, FORNON-WATERQUALITY REASONS, NOLONGERUSEDFORDRINKING WATERMUSTTHE STATE RETAIN THE PUBLIC WATERSUPPLY USEAND CRITERIA IN ITS STANDARDS?

Under 40 CFR 131.10(h)(l), the State may delete the public water supply use designation and criteria if the State adds
or retains other use designations for the waterbodies which have more stringent criteria. The State may also delete the use and criteria if the public water supply is not an 'existing use’ as defined in 131.3 (i.e., achieved on or after November 19751, as long as one of the S131.1O(g) justifications for removal is met.
Otherwise, the State must maintain the criteria even if it restricts the actual use on non-water quality grounds, as long as there is any possibility the water could actually be used for drinking. (This is analogous to the swimming example in the preamble.)

21. WHATIS THE RELATIONSHIP BETWEENWASTELOADALLOCATIONS, TOTAL MAXIMUMDAILY LOADS, ANDTHEANTIDEGRADATION POLICY?

Wasteload allocations distribute the allowable pollutant loadings to a stream between dischargers. Such allocations also consider the contribution to pollutant loadings from nonpoint sources. Wasteload allocations must reflect applicable State water quality standards including the antidegradation policy. No wasteload allocation can be develped or NPDESpermit issued that would result in standard being violated, or, in the case of waters whose quality exceeds that necessary for the Section 101(a)(2) qoals of the Act, can result a lowering of water quality unless the applicable public participation, intergovernmental review and baseline control requirements of the antidegradation policy have been met.

-8-22. DO 'I'Ht itrilt1r~uL~~~.~1'11,,iLn~~b<~~\ti,'~lu~~, I~#. ,,.,A, LJ~~~\, ~.~I\ILLI"A~'~ON REQUIREMENTSWHICHESTABLISH THE PROCEDURESFORDETERMINING THAT WATERQUALITY \JHICH EXCEEDSTHAT NECESSARYTOSUPPORTTHE SECTION 101(a)(2) GOAL OFTHEACT MAYBE LOWERED APPLY TOCONSIDERING ADJUSTMENTSTOTHE\lASTELOADAt.LOCATIO~lS DEVFILOPEDFORTHE DISCHARGERS IN THE AREA?

Yes. Section 131.12(a)(2) of t.he water quality standards regulation is directed towards changes in water quality per se, not just towards changes in standards. The intent is to ensure that no activity which will cause water quality to decline in existing high quality waters is undertaken without adequate public review. Therefore, if a change in wasteload allocation could alter water quality in high quality waters, the public participation and coordination requirements apply0

23. IS THEANSWERTOTHEABOVEQUESTION DIFFERENT IF THEWATER QUALITY IS LESS THANTHAT NEEDEDTO SUPPORT"FISHABLE/SWIMMABLE" USES?

Yes. Nothing in either the water quality standards or the wasteload allocation regulations requires the same degree of public participation or intergovernmental coordination for such waters as is required for high quality waters. However, as discussed in question 10, public participation would still be provided in connection with the issuance of a NPDESpermit or amendment of a 208 plan. Also, if the action which causes reconsideration of the existing wasteloads (such
as dischargers withdrawing from the area) will result in an improvement in water quality which makes a better use attainable, even if not up to the "fishable/swimmable" goal, then the water quality standards must be upgraded and full public review is required for any action affecting changes in standards. Although not specifically required by the standards regulation between the triennial reviews, we recommend that the State conduct a use attainability analysis to determine if water quality improvement will result in attaining higher uses than currently designated in situations where significant changes in wasteloads are expected (see question 10).

24. SEVERAL FACILITIES ON A STREAMSEGMENTDISCHARGEPHOSPHORUSCONTAINING \JASTES. AMBIENT PHOSPHORUS CONCENTRATIONSMEETCLASS B STANDARDS, BUT BARELY. THREE DISCHARGERSACHIEVE ELIMINATION OF DISCHARGEBY DEVELOPINGA LANDTREATMENTSYSTEM. ASA RESULT, ACTUALWATERQUALITY IMPROVES (I.E., PHOSPHORUSLEVELS DECLINE) BUT NOTQUITE TOTHE LEVEL NEEDEDTO MEETCLASSA (FISHABLE/SWIMMABLE) STANDARDS. CANTHETHREEREMAINING DISCHARGERSNOWINCREASE THEIR PHOSPHORUSDISCHARGEWITH THE RESULTTHATWATERQUALITY DECLINES (PHOSPHORUSLEVELS INCREASE) TO PREVIOUS LEVELS?
Nothing in the water quality standards regulation explicitly prohibits this (see answer to questions 10 and 23). Of course, changes in their NPDESpermit limits may be subject to non-water quality constraints, such as BPT or BAT, which may restrict this.

-9-25. SUPPOSE IN THEABOVESITUATION IJATER@UALITY IMPROVESTOTHE

POINT THAT ACTUALWATERQUALITY NOW MEETSCLASSA REQUIREMENTS. IS THEANSWERDIFFERENT?

Yes. The standards must be upgraded (see answer to question 10).

26. ASANALTERNATIVE CASE, SUPPOSEPHOSPHORUS LOADINGSGODOWN ANDWATERQUALITY IMPROVESBECAUSEOFA CHANGEIN FARMING PRACTICES, E.G., INITIATION OFA SUCCESSFULNON-POINT PROGRAM.ARE THE ABOVEANSWERSTHE SAHE?

Yes. Whether the improvement results from a change in point or nonpoint source activity is immaterial to how any aspect of the standards regulation operates. Section 131.10(d) clearly indicates that uses are deemed attainable if they can be achieved by I... cost-effective and reasonable best management practices for nonpoint source control". Section 131.12(a)(2) of the antidegradation policy contains essentially the same wording.

27. \IHENA POLLUTANT DISCHARGECEASESFORANY REASON, MAY THE WASTELOADALLOCATIONS FORTHEOTHERDISCHARGESIN THEAREA BE ADJUSTEDTO REFLECTTHEADDITIONAL LOADINGAVAILABLE?

This may be done consistent with the antidegradation policy only under two circumstances: (11 In "high quality waters” where after the full satisfaction of all public participation and intergovernmental review requirements, such adjustments
are considered necessary to accomodate important economic or social development, and the "threshold" level requirements
are met; or (2) in less thdn "high quality waters”, when the expected improvement in water quality will not cause a better use to be achieved, the adjusted loads still meet water quality standards, and the new wasteload allocations are at least as stringent as technology-based limitations. Of course, all applicable requirements of the Section 402 permit regulations would have to be satisfied before a permittee could increase its discharge.

28. HOWMAYTHE PUBLIC PARTICIPATION REQUIREMENTSBE SATISFIED?

This requirement may be satisfied in several ways. The State may obviously hold a public hearing or hearings. The State m-.'/ also satisfy the requirement by providing the opportunity tcr the public to request a hearing. Activities which may atfect several water bodies in a river basin or sub-basin nay be considered in a single hearing. To ease the resource burden on both the State and public, standards issues may be combined with hearings on environmental impact statements, water management plans, or permits. However, if this is done, the public must be clearly informed that possible changes in water quality standards are being considered along with other activities. In other words, it is inconsistent with the water quality standards regulation to "back-door" changes in standards through actions on EIS's, wasteload allocations, plans, or permits.

-lO-29. WHATIS MEANTBYTHE REQUIREMENTTHAT, WHEREA THERMAL

DISCHARGE IS INCLUDED, THEANTIDEGRADATION POLICY SHALL BE CONSISTENT WITH SECTION 316 OFTHEACT?

This requirement is contained in Section 131.12 (a)(4) of the regulation and is intended to coordinate the requirements and procedures of the antidegadation policy with those established in the Act for setting thermal discharge limitations. Regulations implementing Section 316 may be found at 40 CFR 124.66. The statutory scheme and legislative history indicate that limitations developed under Section 316 take precedence
over other requirements oE the Act.
30. WHATIS TqE RELATIONSHIP BETWEENTHEANTIDEGRADATION POLICY, STATE bJAT9

R RIGHTS USELAWSANDSECTION 101(g) OFTHE CLEAN WATERACT ,lHICH DEALSWITH STATE AUTHORITY TOALLOCATE WATERQUANI'I'TIk:S?

The exact 1iTitations imposed by section 101(g) are unclear: however, th+B legislative history and the courts interpreting it do indic,ite that it <doesnot nullify water quality measures authorized by C?JA(such as water quality standards and their upgrading, and NPDESand 402 permits) even if such measures incidentally affect individual water rights: those authorities also indicate that if there is a way to reconcile water quality needs and water quantity allocations, such accomodation should be be pursued. In other words, where there are alternate ways to meet the water quality requirements of the Act, the one with least disruption to water quantity allocations should be chosen. Where a planned diversion would lead to a violation of water quality standards (either the antitlegradation policy or a criterion), a 404 permit associated with the diversion should be suitably conditioned if possible and/or additional nonpoint and/or point source controls should ye imposed to compensate.

31. AFTER READINGTHE REGULATION, THE PREAMBLE, AND ALL IYFSE QUESTIONSANDANSWERS, I STILL DON'T UNDERSTANDANTIDEGRADATION. WHOM CAN I T4LK TO?

Call the Standards Branch at: (202) 245-3042. You can also call the water quality standards coordinators in each of our EPA Regional offices.

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