Code of Massachusetts Regulations › 310 CMR - DEPARTMENT OF ENVIRONMENTAL PROTECTION › Title 310 CMR 22.00 - Drinking Water › Section 22.07A - Synthetic Organic Chemicals (SOC) Sampling and Analytical Requirements

Current through Register 1525, July 5, 2024
(1)
Synthetic Organic Chemicals
			 MCLs
. The following maximum contaminant levels for organic
			 contaminants apply to community water systems and non-transient, non-community
			 water systems.
CAS No
.
Contaminant
MCL (mg/l)
(a)
15972-60-8
Alachlor
0.002
(b)
Reserved
(c)
Reserved
(d)
Reserved
(e)
1912-24-9
Atrazine
0.003
(f)
1563-66-2
Carbofuran
0.04
(g)
57-74-9
Chlordane
0.002
(h)
96-12-8
Dibromochloropropane
0.0002
(i)
94-75-7
2,4-D
0.07
(j)
72-20-80
Endrin
0.002
(k)
106-93-4
Ethylene dibromide
0.00002
(l)
76-44-8
Heptachlor
0.0004
(m)
1024-57-3
Heptachlor epoxide
0.0002
(n)
58-89-9
Lindane
0.0002
(o)
72-43-5
Methoxychlor
0.04
(p)
1336-36-3
Polychlorinated biphenyls
0.0005
(q)
87-86-5
Pentachlorophenol
0.001
(r)
8001-35-2
Toxaphene
0.003
(s)
93-72-1
2,4,5-TP
0.05
(t)
50-32-8
Benzo(a)pyrene
0.0002
(u)
75-99-0
Dalapon
0.2
(v)
103-23-1
Di(2-ethylhexyl) adipate
0.4
(w)
117-81-7
Di(2-ethylhexyl) phthalate
0.006
(x)
88-85-7
Dinoseb
0.007
(y)
85-00-7
Diquat
0.02
(z)
145-73-3
Endothall
0.1
(aa)
1071-53-6
Glyphosate
0.7
(bb)
118-74-1
Hexachlorobenzene
0.001
(cc)
77-47-4
Hexachlorocyclopentadiene
0.05
(dd)
23135-22-0
Oxamyl (Vydate)
0.2
(ee)
1918-02-1
Picloram
0.5
(ff)
122-34-9
Simazine
0.004
(gg)
1746-01-6
2,3,7,8-TCDD(Dioxin)
3x10-8
(2)
SOC Sampling Requirements
. Beginning with the initial
			 compliance period, analysis of the contaminants listed in 310 CMR 22.07A(1)(a)
			 through (gg) for the purposes of determining compliance with the maximum
			 contaminant level shall be conducted as follows:
(a)
SOC Ground Water Monitoring
			 Protocols
. Groundwater systems shall take a minimum of one sample
			 at every entry point to the distribution system which is representative of each
			 well after treatment (sampling point). Each sample must be taken at the same
			 sampling point unless conditions make another sampling point more
			 representative of each source or treatment plant.
(b)
SOC Surface Water Monitoring
			 Protocols
. Surface water systems [
Note
:
			 For purposes of 310 CMR 22.07A(2)(b), surface water systems include systems
			 with a combination of surface and ground sources.) shall take a minimum of one
			 sample at points in the distribution system that are representative of each
			 source or at each entry point to the distribution system after treatment
			 (sampling point). Each sample must be taken at the same sampling point unless
			 conditions make another sampling point more representative of each source or
			 treatment plant.
(c)
Multiple Sources
. If the system draws water from more
			 than one source and the sources are combined before distribution, the system
			 must sample at an entry point to the distribution system during periods of
			 normal operating conditions (
i.e
., when water representative
			 of all sources is being used).
(d)
Consecutive System Monitoring
. Public water systems
			 that obtain water from another public water system are exempt from conducting
			 compliance monitoring for the purchased portion of the system for the organic
			 chemicals (SOC) under 310 CMR 22.07A, provided that the system from which the
			 water is obtained has conducted the analyses required under 310 CMR 22.07A,
			 unless otherwise specified by the Department.