United States

Environmental Protection

Agency

Office of Water

(4606)

EPA 816-K-01-004

June 2001

www.epa.gov/safewater

Factoids: 

Drinking Water and 

Ground Water

Statistics for 2000 
There are approximately 170,000 public drinking water systems in the United

States. Each of these systems regularly supplies drinking water to at least 25 people or 15

service connections. Beyond their common purpose, the 170,000 systems vary widely. 

The following tables group water systems into categories that show their similarities and

differences. For example, the first table shows that most people in the US (263 million)

get their water from a community water system. There are more than 54,000 community

water systems, but just seven percent of those systems (3,769) serve 81 percent of the

people. The second table shows that more water systems have ground water than surface

water as a source - but more people drink from a surface water system. Other tables

break down these national numbers by state, territory, and EPA region.

This package also contains figures on the types and locations of underground

injection control wells. EPA and the states regulate the placement and operation of these

wells to ensure that they do not threaten underground sources of drinking water.

The drinking water system statistics on the following pages are taken from the Safe

Drinking Water Information System/Federal version (SDWIS/Fed). SDWIS/Fed is the

U.S. Environmental Protection Agency’s official record of public drinking water systems,

their violations of state and EPA regulations, and enforcement actions taken by EPA or

states as a result of those violations. EPA maintains the database using information

collected and submitted by the states. The underground injection control program

statistics are based on separate reporting from the states to EPA. For more information

and additional drinking water data tables, please visit

http://www.epa.gov/safewater/getdata.html.

Acronyms & Abbreviations

CWS: Community Water System

FY: (federal) Fiscal Year [October 1 -September 30]

M/R: Monitoring/Reporting violation [water system’s failure to monitor for, or report to the

state, the level of a contaminant on the required schedule) 

MCL: Maximum Contaminant Level [the legal limit on a contaminant in drinking water]

NTNCWS: Non-Transient Non-Community Water System

Other: Other violations of EPA rules (including failure to provide public notice of another

violation, or failure to prepare and/or distribute a Consumer Confidence Report)

Pop. served: Population served (by a water system)

PWS: Public Water System

PWSS: Public Water System Supervision program

SDWIS/FED: Safe Drinking Water Information System/Federal version

TNCWS: Transient Non-Community Water System

TT: Treatment Technique [a drinking water treatment required by EPA or state rules]
FY2000 Drinking Water Factoids

Public Water System Inventory data

Active, current systems, from Safe Drinking Water Information System/Federal version (SDWIS/FED) 00Q4 frozen inventory table

System size

by population served Very Small Small Medium Large Very Large Total

500 or less 501-3,300 3,301-10,000 10,001-100,000 >100,000

# systems 31,688 14,149 4,458 3,416 353 54,064 

Pop. served 5,148,696 19,931,399 25,854,061 96,709,145 116,282,810 263,926,111 

% of systems 59% 26% 8% 6% 1% 100%

% of pop 2% 8% 10% 37% 44% 100%

# systems 17,598 2,839 96 23 3 20,559 

Pop. served 2,440,352 2,795,510 480,243 620,719 579,937 6,916,761 

% of systems 86% 14% 0% 0% 0% 100%

% of pop 35% 40% 7% 9% 8% 100%

# systems 90,391 2,632 130 54 3 93,210 

Pop. served 7,521,276 2,617,526 731,889 1,329,043 735,001 12,934,735 

% of systems 97% 3% 0% 0% 0% 100%

% of pop 58% 20% 6% 10% 6% 100%

Total # systems 139,677 19,620 4,684 3,493 359 167,833 

Water source

 Type Ground Water Surface Water Totals 

# systems 42,661 11,403 54,064 

Pop. served 85,868,456 178,057,655 263,926,111 

% of systems 79% 21% 100%

% of pop 33% 67% 100%

# systems 19,738 821 20,559 

Pop. served 5,984,416 932,345 6,916,761 

% of systems 96% 4% 100%

% of pop 87% 13% 100%

# systems 91,298 1,912 93,210 

Pop. served 12,017,370 917,365 12,934,735 

% of systems 98% 2% 100%

% of pop 93% 7% 100%

Total # systems 153,697 14,136 167,833 

 179,907,365 103,870,242 

Ground water systems = ground water (GW), purchased ground water (GWP)

Surface water systems = surface water (SW), purchased surface water (SWP), 

ground water under the direct influence of surface water (GU),

purchased ground water under the direct influence of surface water (GUP).

SDWIS/FED 00Q4 tables are "frozen" in early January 2001

TNCWS

CWS

NTNCWS

TNCWS

CWS

CWS = Community Water System: A public water system that supplies water to the same population year-round.

NTNCWS = Non-Transient Non-Community Water System: A public water system that regularly supplies water to at least 25 of the 

same people at least six months per year, but not year-round. Some examples are schools, factories, office buildings, and hospitals 

which have their own water systems.

TNCWS = Transient Non-Community Water System: A public water system that provides water in a place such as a gas station or 

campground where people do not remain for long periods of time.

NTNCWS

Page 1
FY2000 water system data--by State Key: # systems

Active, current systems, from SDWIS/FED 00Q4 frozen inventory table pop. served

Health-based (Treatment Technique & Maximum Contaminant Level) violations, from 00Q4 frozen violations table

CWS NTNCWS TNCWS Total Ground Surface

 208 442 995 1,645 1,395 250 77 17%

 45,579 445,954 105,725 597,258 294,842 302,416 62,040 14%

 38 575 89 702 455 247 21 4%

 25,090 4,934,311 8,500 4,967,901 1,455,370 3,512,531 120,996 2%

 114 726 359 1,199 850 349 104 14%

 12,597 2,258,368 17,789 2,288,754 909,925 1,378,829 179,370 8%

 216 799 672 1,687 1,573 114 68 9%

 149,965 4,356,171 158,447 4,664,583 1,491,970 3,172,613 387,396 9%

 1,290 3,283 3,573 8,146 7,030 1,116 181 6%

 584,333 34,084,987 1,111,711 35,781,031 9,386,226 26,394,805 1,939,618 6%

 166 830 1,105 2,101 1,636 465 43 5%

 54,404 3,835,139 221,455 4,110,998 564,841 3,546,157 375,303 10%

 627 599 2,479 3,705 3,636 69 67 11%

 125,787 2,648,571 80,540 2,854,898 508,833 2,346,065 53,286 2%

 2 2 2 0%

 595,000 595,000 595,000 0%

 96 240 215 551 546 5 18 8%

 24,192 605,342 53,476 683,010 225,785 457,225 101,907 17%

 1,083 2,009 3,515 6,607 6,545 62 83 4%

 285,318 15,655,773 297,517 16,238,608 14,009,538 2,229,070 568,565 4%

 276 1,673 623 2,572 2,361 211 52 3%

 79,736 6,560,186 116,078 6,756,000 1,639,424 5,116,576 62,308 1%

 14 121 6 141 122 19 8 7%

 7,307 1,262,878 2,450 1,272,635 1,183,658 88,977 68,494 5%

 167 1,153 612 1,932 1,776 156 64 6%

 46,942 2,575,716 80,213 2,702,871 1,448,927 1,253,944 126,386 5%

 258 747 1,075 2,080 1,991 89 114 15%

 55,155 907,653 125,908 1,088,716 832,503 256,213 155,469 17%

 438 1,801 3,562 5,801 5,118 683 258 14%

 157,030 10,947,281 395,476 11,499,787 3,252,037 8,247,750 1,032,236 9%

 759 916 3,162 4,837 4,715 122 124 14%

 492,393 4,119,623 364,396 4,976,412 2,705,505 2,270,907 301,173 7%

 35 917 127 1,079 748 331 93 10%

 14,364 2,418,352 14,287 2,447,003 773,298 1,673,705 121,863 5%

 89 467 156 712 322 390 18 4%

 31,569 4,294,353 11,494 4,337,416 329,847 4,007,569 131,715 3%

 213 1,207 400 1,820 1,737 83 108 9%

 82,274 5,162,586 95,925 5,340,785 3,267,000 2,073,785 321,738 6%

 224 513 891 1,628 1,446 182 125 24%

 70,774 8,640,236 160,019 8,871,029 2,017,089 6,853,940 4,997,224 58%

 572 511 2,732 3,815 3,738 77 35 7%

 160,236 4,614,127 141,310 4,915,673 818,033 4,097,640 60,854 1%

 455 399 1,249 2,103 2,027 76 86 22%

 72,718 611,531 203,762 888,011 469,260 418,751 215,096 35%

 1,826 1,472 9,052 12,350 12,047 303 89 6%

 504,705 7,044,085 1,108,745 8,657,535 3,328,383 5,329,152 114,019 2%

 646 953 6,753 8,352 8,239 113 24 3%

 100,705 3,798,571 393,760 4,293,036 2,878,930 1,414,106 33,252 1%

 235 1,439 1,027 2,701 2,454 247 133 9%

 79,873 4,715,214 149,546 4,944,633 1,796,583 3,148,050 88,592 2%

 117 1,228 140 1,485 1,477 8 51 4%

 87,810 2,876,508 26,393 2,990,711 2,880,102 110,609 257,681 9%

AK

AL

AR

AZ

CA

CO

CT

MN

MO

MS

MA

MD

ME

MI

IN

KS

KY

LA

 CWSs w/ reported 

health-based violations 

DC

DE

FL

GA

HI

IA

ID

IL

Page 2
FY2000 water system data--by State, cont. Key: # systems

Active, current systems, from SDWIS/FED 00Q4 frozen inventory table Pop served

Health-based (Treatment Technique & Maximum Contaminant Level) violations, from 00Q4 frozen violations table

CWS NTNCWS TNCWS Total Ground Surface

 225 645 1,153 2,023 1,801 222 45 7%

 44,769 2,716,262 165,756 2,926,787 2,064,878 861,909 103,982 4%

 658 2,374 4,479 7,511 6,955 556 166 7%

 193,761 5,794,107 412,002 6,399,870 1,942,355 4,457,515 188,836 3%

 29 321 200 550 469 81 31 10%

 3,958 555,123 17,152 576,233 222,900 353,333 22,058 4%

 178 619 532 1,329 1,300 29 197 32%

 43,190 1,392,476 66,639 1,502,305 946,096 556,209 267,605 19%

 446 674 1,036 2,156 2,102 54 125 19%

 88,587 766,072 207,906 1,062,565 567,170 495,395 59,799 8%

 940 602 2,737 4,279 4,182 97 41 7%

 279,033 7,678,147 351,179 8,308,359 3,028,425 5,279,934 1,172,024 15%

 155 616 503 1,274 1,222 52 85 14%

 34,508 1,489,113 208,412 1,732,033 1,523,385 208,648 96,959 7%

 100 292 283 675 614 61 17 6%

 40,380 1,579,690 59,527 1,679,597 271,798 1,407,799 19,579 1%

 761 2,868 7,001 10,630 9,554 1,076 63 2%

 358,726 17,690,198 856,655 18,905,579 5,488,212 13,417,367 2,076,220 12%

 1,106 1,429 3,404 5,939 5,595 344 33 2%

 275,606 10,142,141 543,094 10,960,841 4,128,314 6,832,527 83,733 1%

 123 1,171 438 1,732 1,016 716 44 4%

 18,645 3,434,926 43,495 3,497,066 714,820 2,782,246 195,553 6%

 331 884 1,430 2,645 2,361 284 177 20%

 69,529 3,095,044 220,176 3,384,749 905,085 2,479,664 186,658 6%

 1,266 2,200 6,923 10,389 9,825 564 105 5%

 509,453 10,518,120 864,529 11,892,102 2,870,279 9,021,823 417,400 4%

 71 83 325 479 454 25 6 7%

 24,566 950,151 53,135 1,027,852 203,572 824,280 60,118 6%

 221 692 614 1,527 1,282 245 81 12%

 75,407 3,303,073 55,421 3,433,901 785,769 2,648,132 751,300 23%

 30 474 214 718 584 134 45 9%

 3,924 631,186 36,049 671,159 288,745 382,414 15,012 2%

 60 633 480 1,173 719 454 29 5%

 30,592 5,082,640 54,130 5,167,362 1,388,694 3,778,668 142,167 3%

 862 4,574 1,429 6,865 5,700 1,165 182 4%

 339,537 20,920,423 288,783 21,548,743 7,253,194 14,295,549 439,618 2%

 64 430 459 953 847 106 41 10%

 47,314 2,471,221 82,361 2,600,896 960,145 1,640,751 148,073 6%

 623 1,326 1,827 3,776 3,416 360 188 14%

 285,368 6,496,739 944,111 7,726,218 1,616,680 6,109,538 122,363 2%

 215 438 694 1,347 1,214 133 56 13%

 39,473 502,741 716,196 1,258,410 747,583 510,827 35,640 7%

 316 2,300 1,595 4,211 3,923 288 272 12%

 263,654 5,060,995 301,376 5,626,025 2,708,630 2,917,395 1,240,497 25%

 1,020 1,140 9,564 11,724 11,679 45 96 8%

 210,193 3,645,732 725,062 4,580,987 2,919,649 1,661,338 551,949 15%

 196 583 635 1,414 1,036 378 37 6%

 101,298 1,810,721 42,424 1,954,443 340,038 1,614,405 103,956 6%

 86 272 378 736 621 115 15 6%

 16,240 410,396 75,279 501,915 182,251 319,664 13,317 3%

 20,244 52,662 92,902 165,808 152,455 13,353 4,221 

 6,748,567 258,105,953 12,835,771 102,536,576 175,153,715 20,390,997 

UT

VA

WY

WI

OK

NJ

NV

SD

TN

VT

WA

WV

TX

SC

OR

PA

NY

OH

RI

NM

NC

ND

NE

NH

MT

 CWSs w/ reported 

health-based violations 

Page 3
FY2000 water system data--Tribal systems Key: # systems

Active, current systems, from SDWIS/FED 00Q4 frozen inventory table Pop served

Health-based (Treatment Technique & Maximum Contaminant Level) violations, from 00Q4 frozen violations table

Region CWS NTNCWS TNCWS Total Ground Surface

 2 1 3 6 6 0%

 60 120 670 850 850 0%

 1 4 5 4 1 0%

 300 2,929 3,229 1,229 2,000 0%

 3 14 23 40 37 3 0%

 1,225 15,893 3,360 20,478 15,957 4,521 0%

 34 80 11 125 123 2 7 9%

 28,762 34,762 646 64,170 63,681 489 417 1%

 8 41 20 69 67 2 14 34%

 966 63,536 1,329 65,831 57,305 8,526 24,768 39%

 4 9 13 12 1 2 22%

 525 6,173 6,698 6,200 498 3,298 53%

 9 107 1 117 100 17 10 9%

 4,511 66,660 26 71,197 50,609 20,588 4,493 7%

 21 406 71 498 462 36 11 3%

 10,557 222,190 65,184 297,931 259,853 38,078 5,428 2%

 13 86 5 104 99 5 11 13%

 4,525 24,586 485 29,596 25,340 4,256 3,866 16%

 90 748 139 977 910 67 55 

 50,606 436,849 72,525 481,024 78,956 42,270 

FY2000 water system data--Commonwealths and Territories

Active, current systems, from SDWIS/FED 00Q4 frozen inventory table Key: # systems

Health-based (Treatment Technique & Maximum Contaminant Level) violations, from 00Q4 frozen violations table Pop served

CWS NTNCWS TNCWS Total Ground Surface

 22 22 12 10 14 64%

 52,458 52,458 49,618 2,840 6,045 12%

 2 10 12 8 4 0%

 770 109,070 109,840 20,990 88,850 0%

 6 30 7 43 43 0%

 3,039 50,769 620 54,428 54,428 0%

 46 438 6 490 263 227 313 71%

 38,836 5,059,931 2,215 5,100,982 722,633 4,378,349 4,197,044 83%

 2 16 18 2 16 0%

 1,163 12,060 13,223 400 12,823 0%

 169 138 156 463 4 459 9 7%

 73,780 99,021 23,604 196,405 4,573 191,832 1,009 1%

 225 654 169 1,048 332 716 336 

 117,588 5,383,309 26,439 852,642 4,674,694 4,204,098 

Amer. 

Samoa

Virgin 

Islands

Guam

N. Marianas 

Islands

Puerto Rico

Palau

08

09

10

04

 CWSs w/ reported 

health-based violations 

 CWSs w/ reported 

health-based violations 

05

06

07

01

02

Page 4
Government Performance and Results Act--PWSS measure

Nationally

2000 91%

1999 91%

1998 89%

1997 87%

1996 86%

1995 84%

1994 83%

1993 79%

By region

 2 3 1 4 5 6 7 8 9 10

2000 62% 76% 97% 95% 95% 96% 95% 94% 94% 83%

1999 75% 61% 98% 95% 95% 95% 95% 94% 97% 94%

1998 64% 60% 97% 95% 95% 95% 94% 93% 95% 89%

1997 62% 55% 97% 93% 92% 93% 95% 91% 95% 74%

1996 60% 53% 92% 93% 92% 94% 95% 92% 91% 74%

1995 57% 52% 91% 92% 92% 89% 95% 90% 88% 75%

1994 57% 55% 87% 90% 88% 87% 94% 91% 90% 87%

1993 60% 56% 85% 90% 77% 92% 93% 92% 69% 85%

CT NJ DE AL IL AR IA CO AZ AK

ME NY DC FL IN LA KS MT CA ID

MA PR MD GA MI NM MO ND HI OR

NH VI PA KY MN OK NE SD NV WA

RI VA MS OH TX UT AS

VT WV NC WI WY GU

SC MP

TN PW

Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations.

Population data are based on active, current water systems

For FY2000, population and violation data are from SDWIS/FED 00Q4 frozen tables.

For FY1999, population and violation data are from SDWIS/FED 99Q4 frozen tables.

For FY1998, population and violation data are from SDWIS/FED 98Q4 frozen tables.

For FY1997 and earlier, population and violation data are from SDWIS/FED 98Q1 frozen tables.

GPRA requires agencies to develop plans for what they intend to accomplish, measure how well they are 

doing, make appropriate decisions based on the information they have gathered, and communicate 

information about their performance to Congress and to the public.

EPA's goal is that by 2005, the population served by community water systems providing drinking 

water that meets all existing health-based standards will increase to 95% from a baseline of 83% 

in 1994. 

Page 5
CWS violations reported

by FY FY2000 data from SDWIS/FED 00Q4 frozen tables, except for Chem M/Rs which are from 01Q1

FY1999 data from SDWIS/FED 99Q4 frozen tables, except for Chem M/Rs which are from 00Q1

FY1998 data from SDWIS/FED 98Q4 frozen tables, except for Chem M/Rs which are from 99Q1

FY1997 and earlier data from SDWIS 98Q1 frozen tables

Number of violations

FY MCL TT M/R Other* Total

2000 3,045 4,753 52,013 10,650 70,461 

1999 2,246 5,528 58,384 1,038 67,196 

1998 2,520 6,340 54,440 1,614 64,914 

1997 2,743 5,804 64,385 1,471 74,403 

1996 3,078 7,391 121,253 1,151 132,873 

1995 3,766 7,147 139,072 1,983 151,968 

Number of systems in violation

FY MCL TT M/R Other* Total **

2000 1,677 3,160 13,781 8,948 21,359 

1999 1,057 3,321 9,447 627 12,151 

1998 1,105 3,746 10,002 899 13,024 

1997 1,109 3,721 10,949 860 14,016 

1996 1,329 4,411 13,039 738 16,418 

1995 1,795 4,652 14,584 959 18,230 

Population affected

FY MCL TT M/R Other* Total **

2000 15,391,464 11,946,983 34,193,873 13,882,763 62,928,310 

1999 15,854,722 11,079,343 19,868,126 2,529,718 38,161,938 

1998 18,485,545 10,393,015 28,313,863 2,369,301 48,945,871 

1997 22,059,698 13,848,094 27,224,547 3,879,160 58,086,370 

1996 22,683,315 16,040,225 32,529,745 4,671,792 63,686,726 

1995 26,409,050 23,547,689 40,672,345 8,707,791 73,201,326 

by system size

Number of violations

MCL TT M/R Other Total

Very small 1,604 3,046 40,345 7,973 52,968 

Small 850 1,122 7,406 1,996 11,374 

Medium 249 318 2,041 447 3,055 

Large 294 251 2,039 219 2,803 

Very large 48 16 182 15 261 

Number of systems in violation

MCL TT M/R Other Total **

Very small 944 2,001 10,041 6,592 14,868 

Small 435 710 2,506 1,738 4,346 

Medium 124 251 704 412 1,206 

Large 152 186 487 193 863 

Very large 22 12 43 13 76 

Population affected

MCL TT M/R Other Total **

Very small 161,408 324,588 1,438,809 949,875 2,196,522 

Small 600,020 999,776 3,293,589 2,309,815 5,839,126 

Medium 740,753 1,574,032 4,037,524 2,350,790 7,035,731 

Large 4,790,097 4,449,100 14,365,948 4,693,943 24,194,288 

Very large 9,099,186 4,599,487 11,058,003 3,578,340 23,662,649 

* Jump in FY2000 due to new violations for failing to issue, or issuing an insufficient, Consumer Confidence report

** Totals for the number of systems in violation, and for population affected, should be lower than the sum in each row.

 This is because some systems will have incurred more than one type of violation.

Page 6
NTNCWS violations reported

FY2000 data from SDWIS/FED 00Q4 frozen tables, except for Chem M/Rs, which are from 01Q1

FY1999 data from SDWIS/FED 99Q4 frozen tables, except for Chem M/Rs which are from 00Q1

FY1998 data from SDWIS/FED 98Q4 frozen tables, except for Chem M/Rs which are from 99Q1

FY1997 and earlier data from SDWIS/FED 98Q1 frozen tables

Number of violations

FY MCL TT M/R Other Total

2000 837 1,245 23,085 201 25,368 

1999 225 1,349 25,796 120 27,490 

1998 165 1,322 26,043 255 27,785 

1997 202 1,349 28,249 159 29,959 

1996 405 1,792 53,345 189 55,731 

1995 659 1,672 54,543 255 57,129 

Number of systems in violation

FY MCL TT M/R Other Total *

2000 580 924 5,508 162 6,432 

1999 178 958 3,629 88 4,398 

1998 103 945 3,942 157 4,672 

1997 98 985 4,623 105 5,355 

1996 252 1,281 6,066 134 6,945 

1995 416 1,244 6,275 166 7,272 

Population affected

FY MCL TT M/R Other Total *

2000 217,596 276,448 1,763,388 36,519 2,077,863 

1999 53,500 292,367 848,516 34,947 1,112,853 

1998 23,963 232,755 994,786 47,772 1,187,783 

1997 32,041 280,021 1,241,807 33,877 1,483,754 

1996 93,138 380,187 1,435,181 30,201 1,736,465 

1995 150,148 392,311 1,684,183 49,236 2,010,395 

TNCWS violations reported

Number of violations

FY MCL TT M/R Other Total

2000 314 4,407 35,280 908 40,909 

1999 226 4,956 36,266 752 42,200 

1998 284 5,201 28,116 2,159 35,760 

1997 379 5,408 32,581 1,794 40,162 

1996 564 5,934 55,420 1,810 63,728 

1995 492 4,879 48,843 2,082 56,296 

Number of systems in violation

FY MCL TT M/R Other Total *

2000 182 3,634 17,740 652 20,345 

1999 140 3,876 19,694 498 22,233 

1998 90 3,799 15,997 1,115 18,771 

1997 128 4,070 17,497 975 20,532 

1996 150 4,539 25,614 1,064 28,520 

1995 153 3,857 25,075 1,161 27,689 

Population affected

FY MCL TT M/R Other Total *

2000 46,201 507,741 2,570,999 78,494 2,983,920 

1999 42,582 646,469 2,217,212 63,264 2,706,984 

1998 58,801 481,642 2,102,061 143,464 2,458,001 

1997 62,557 539,292 2,230,009 128,471 2,651,801 

1996 48,098 625,342 3,411,919 115,250 3,731,987 

1995 65,295 671,739 3,219,663 128,290 3,622,946 

* Totals for the number of systems in violation, and for population affected, should be lower than the sum in each row.

This is because some systems will have incurred more than one type of violation.

Page 7
FY2000 MCL and TT violations reported

From SDWIS/FED 00Q4 frozen violations table Key: # violations

# systems

Pop. affected

Very small Small Medium Large Very Large

25-500 501-3,300 3,301-10,000 10,001-100,000 >100,000 Total

Applies to all water systems

 1,066 7,481 284 197 11 9,039 

 766 5,824 234 155 9 6,988 

 1,008,878 640,751 1,480,350 3,712,812 3,726,152 10,568,943 

Organics: Applies to CWS and NTNCWS

 6 2 20 28 

 3 2 10 15 

 2,890 146 206,809 209,845 

 8 47 4 5 2 66 

 8 28 3 4 1 44 

 16,647 3,632 23,579 94,325 535,335 673,518 

 5 8 1 2 16 

 4 5 1 1 11 

 4,579 790 14,390 180,000 199,759 

Inorganics: Applies to CWS and NTNCWS

 157 624 13 9 1 804 

 67 377 7 5 1 457 

 87,287 44,431 30,444 142,829 158,000 462,991 

 15 67 8 2 92 

 8 43 7 2 60 

 10,549 8,615 35,924 42,058 97,146 

Applies to CWS

 130 166 25 25 346 

 72 89 18 16 195 

 100,322 18,685 98,611 356,727 574,345 

Applies to surface water systems

 588 1,236 180 197 33 2,234 

 235 518 84 97 11 945 

 328,257 91,012 508,909 3,163,152 6,729,982 10,821,312 

Applies to CWS and NTNCWS

 390 1,381 76 100 15 1,962 

 320 1,078 51 84 15 1,548 

 388,147 158,200 285,072 2,666,466 4,577,567 8,075,452 

Acronyms:

TTHM (VOC) = Total Trihalomethanes

Other VOC = Regulated volatile organic contaminants (e.g., Benzene) other than TTHMs

SOC = Synthetic organic chemicals (e.g., Atrazine)

Other IOC = Regulated inorganic contaminants (e.g., arsenic) other than Copper, Lead, Nitrate, and Nitrite

SWTR = Surface Water Treatment Rule 

TCR/T = Total Coliform Rule/

TCR/T

SWTR

TTHM (VOC)

Other VOC

SOC

Lead & Copper

Radionuclides

Nitrates

Other IOC

Page 8
FY2000 Monitoring/Reporting violations reported

From SDWIS/FED 00Q4 frozen violations table (except for Chem M/Rs) Key: # violations

Chem M/R data are from SDWIS/FED 01Q1 frozen violations table # systems

Pop. affected

Very small Small Medium Large Very Large

25-500 501-3,300 3,301-10,000 10,001-100,000 >100,000 Total

Applies to all water systems

 2,661 33,842 458 220 20 37,201 

 1,723 19,739 324 172 10 21,968 

 2,127,499 1,991,992 1,868,571 4,965,205 3,556,204 14,509,471 

Organics: Applies to CWS and NTNCWS

 6 12 2 50 1 71 

 6 9 2 43 1 61 

 14,138 1,656 8,125 1,101,985 107,593 1,233,497 

 3,479 21,502 699 973 8 26,661 

 164 894 32 44 6 1,140 

 195,663 130,285 167,757 1,081,925 2,550,835 4,126,465 

 799 6,399 74 105 70 7,447 

 68 271 17 20 5 381 

 77,275 36,842 86,924 528,272 908,835 1,638,148 

Inorganics: Applies to CWS and NTNCWS

 670 13,137 188 75 21 14,091 

 502 10,436 83 37 4 11,062 

 557,144 999,611 487,136 1,114,630 891,419 4,049,940 

 685 4,474 187 42 6 5,394 

 108 490 29 14 3 644 

 138,574 68,002 161,068 432,866 1,412,332 2,212,842 

Applies to CWS

 2,661 33,842 458 220 20 37,201 

 1,723 19,739 324 172 10 21,968 

 2,127,499 1,991,992 1,868,571 4,965,205 3,556,204 14,509,471 

Applies to surface water systems

 439 1,868 110 70 33 2,520 

 144 445 50 40 11 690 

 191,121 71,431 270,656 1,380,844 3,419,872 5,333,924 

Applies to CWS and NTNCWS

 1,794 11,281 414 272 25 13,786 

 1,396 8,424 326 209 20 10,375 

 1,692,760 1,099,127 1,857,371 6,448,697 4,796,504 15,894,459 

Acronyms:

TTHM (VOC) = Total Trihalomethanes

Other VOC = Regulated volatile organic contaminants (e.g., Benzene) other than TTHMs

SOC = Synthetic organic chemicals (e.g., Atrazine)

Other IOC = Regulated inorganic contaminants (e.g., arsenic) other than Copper, Lead, Nitrate, and Nitrite

SWTR = Surface Water Treatment Rule 

TCR/T = Total Coliform Rule/

Lead & Copper

TCR/T

SWTR

Nitrates

Other IOC

Radionuclides

TTHM (VOC)

Other VOC

SOC

Page 9
Underground Injection Control program--inventory of wells

Types of wells:

Class I Deep industrial waste disposal

Class II For oil and natural gas production

Class III Related to mineral recovery

Class IV Banned, inject hazardous or radioactive waste above USDWs

Class V Generally shallow disposal wells. There are an estimated 650,000 Class V wells nationally

Class I through IV data from annual reporting by states and EPA Regions

The Class V estimate is based on state estimates and modeling of storm water and large capacity septics

Class I 

hazardous 

waste wells

Class I nonhazardous 

waste wells

Class II wells

Class III 

facilities 

(which may 

contain multiple 

wells)

Class III wells

Class IV 

facilities 

(which may 

contain multiple 

wells)

AK 6 925

AL 347 1 3

AR 6 10 1,078

AZ 3 15

CA 6 24,955 1 73

CO 5 787 2 35

FL 1 136 64

IA 1

IL 3 1 8,949

IN 4 7 1,340

KS 6 44 16,371 5 157

KY 1 3,429

LA 17 28 3,824 15 67

MI 9 15 1,459 3 22

MO 211

MS 6 1 881

MT 897

ND 2 377

NE 1 704 1 1,879

NM 5 5,577 19 104

NV 12

NY 1 503 6 126

OH 10 2 2,890 3 47 1

OK 11 11,448 1 1

OR 2

PA 10 1,897 1 10

SD 63

TN 14

TX 60 46 51,998 86 5,789

UT 256 1 4 2

VA 3 252 1 3 1

WA 1

WV 700 3 31

WY 23 4,666 12 8,211 1

EPA R2 tribal 12

EPA R6 tribal 1 2,674

EPA R8 tribal 723

EPA R9 tribal 542

122 364 146,878 164 16,577 5