1. (a) Pursuant to RSA 485-C:6, ambient groundwater quality standards (AGQS) shall apply to all regulated contaminants that result from human operations or activities.

2. (b) The following shall apply to Table 600-1, below:

   1. (1) The standard for total trihalomethanes, namely bromoform, bromodichloromethane, dibromochloromethane, and trichloromethane (chloroform), shall be 80 micrograms per liter (μg/L) if the groundwater is contaminated by chlorinated water supplies;
   2. (2) Positives for total coliform shall be confirmed by the presence of other wastewater parameters, such as fecal coliform, Escherichia coli, fecal streptococcus, nitrates, and chlorides;
   3. (3) Unless otherwise noted, concentrations shall be measured in micrograms per liter (μg/L), which is equivalent to parts per billion (ppb); and
   4. (4) Gross alpha radionuclides, radium 226 and 228, strontium 90, and tritium shall be measured in picocuries per liter (pCi/L).

3. (c) AGQS shall be as set forth in Table 600-1 below:

   Table 600-1

   AMBIENT GROUNDWATER QUALITY STANDARDS

   Chemical Name

   CAS No.

   AGQS

   μg/L (ppb)

   Acenaphthene

   83-32-9

   420

   Acenaphthylene

   208-96-8

   420

   Acetone

   67-64-1

   6,000

   Acrylonitrile

   107-13-1

   5

   Alachor

   15972-60-8

   2

   Aldicarb

   116-06-3

   7

   Aldicarb sulfone

   1646-88-4

   7

   Aldicarb sulfoxide

   1646-87-3

   7

   Aldrin

   309-00-2

   0.1

   Allyl chloride

   107-05-1

   7.4

   Anthracene

   120-12-7

   2,100

   Antimony

   7440-36-0

   6

   Arsenic, through June 30, 2021

   7440-38-2

   10

   Arsenic, as of July 1, 2021

   7440-38-2

   5

   Atrazine

   1912-24-9

   3

   Barium

   7440-39-3

   2,000

   Benzene

   71-43-2

   5

   Benzidine

   92-87-5

   0.8

   Benzo(a)anthracene

   56-55-3

   0.1

   Benzo(a)pyrene

   50-32-8

   0.2

   Benzo(b)fluoranthene

   205-99-2

   0.1

   Benzo(g,h,i)perylene

   191-24-2

   210

   Benzoic Acid

   65-85-0

   28,000

   Benzo(k)fluoranthene

   207-08-9

   0.5

   Beryllium

   7440-41-7

   4

   Biphenyl, 1,1-

   92-52-4

   350

   bis-(2-chloroethyl)ether

   111-44-4

   10

   bis-(2-chloroisopropyl)ether

   39638-32-9

   300

   bis-(chloromethyl)ether

   542-88-1

   10

   Bisphenol A

   80-05-7

   120

   Bromobenzene

   108-86-1

   60

   Boron

   7440-42-8

   6,000

   Bromodichloromethane

   75-27-4

   0.6

   Bromoform

   75-25-2

   4

   Bromomethane

   74-83-9

   10

   Butylbenzene, n-

   104-51-8

   260

   Butylbenzene, sec-

   135-98-8

   260

   Butylbenzene, tert

   98-06-6

   260

   Cadmium

   7440-43-9

   5

   Camphor

   76-22-2

   50

   Carbofuran

   1563-66-2

   40

   Carbon disulfide

   75-15-0

   70

   Carbon tetrachloride

   56-23-5

   5

   Chlordane

   57-74-9

   2

   Chloroaniline, p-

   106-47-8

   28

   Chloromethane

   74-87-3

   30

   Chlorophenol, 2-

   95-57-8

   40

   Chlorotoluene

   95-49-8

   100

   Chlorotrifluoroethylene (CFC 1113)

   79-38-9

   5

   Chromium (Total)

   7440-47-3

   100

   Chrysene

   218-01-9

   5

   Clopyralid (Stinger 3SC)

   1702-17-6

   3500

   Copper

   7440-50-8

   1300

   Cyanide

   57-12-5

   200

   Cyanazine (Bladex 4L/90DF)

   21725-46-2

   1

   2,4-D (Dichlorophenoxy acetic acid, 2,4-)

   94-75-7

   70

   Dalapon

   75-99-0

   200

   DDD (Dichlorodiphenyl dichloroethane, p,p')

   72-54-8

   0.1

   DDE (Dichlorodiphenyl dichloroethylene, p,p')

   72-55-9

   0.1

   DDT (Dichlorodiphenyl trichloroethane, p,p')

   50-29-3

   0.1

   Dibenzo(a,h)anthracene

   53-70-3

   0.1

   Dibromochloromethane

   124-48-1

   60

   Dibromochloropropane

   96-12-8

   0.2

   Dibutylphthalate

   84-74-2

   800

   Dichlorobenzene, 1,2- (o-DCB)

   95-50-1

   600

   Dichlorobenzene, 1,3- (m-DCB)

   541-73-1

   600

   Dichlorobenzene, 1,4- (p-DCB)

   106-46-7

   75

   Dichlorobenzidine, 3,3’-

   91-94-1

   1.3

   Dichlorodifluoromethane

   75-71-8

   1,000

   Dichloroethane, 1,1-

   75-34-3

   81

   Dichloroethane, 1,2-

   107-06-2

   5

   Dichloroethylene, 1,1-

   75-35-4

   7

   Dichloroethylene, cis-1,2-

   156-59-2

   70

   Dichloroethylene, trans-1,2-

   156-60-5

   100

   Dichloromethane (Methylene chloride )

   75-09-2

   5

   Dichlorophenol, 2,4-

   120-83-2

   20

   Dichloropropane, 1,2-

   78-87-5

   5

   Dichloropropene, 1,3-

   542-75-6

   0.5

   Dieldrin

   60-57-1

   0.1

   Diethyl ether

   60-29-7

   1,400

   Di(ethylhexyl)adipate

   103-23-1

   400

   Di(2-ethylhexyl)phthalate (DEHP)

   117-81-7

   6

   Diisopropyl ether (DIPE)

   108-20-3

   120

   Dimethyl phthalate

   131-11-3

   50,000

   Dimethylphenol, 2,4-

   105-67-9

   140

   Dinitrophenol, 2,4-

   51-28-5

   14

   Dinitrotoluene, 2,4-

   121-14-2

   10

   Dinoseb

   88-85-7

   7

   Dioxane, 1,4-

   123-91-1

   0.32

   Diphenylhydrazine, 1,2-

   122-66-7

   10

   Diquat

   85-00-7

   20

   Endosulfan

   115-29-7

   42

   Endothall

   145-73-3

   100

   Endrin

   72-20-8

   2

   Ethylbenzene

   100-41-4

   700

   Ethylene dibromide

   106-93-4

   0.05

   Ethylene glycol

   107-21-1

   14,000

   Ethyl tertiary-butyl ether (ETBE)

   637-92-3

   40

   Fluoranthene

   206-44-0

   280

   Fluorene

   86-73-7

   280

   Fluoride

   16984-48-8

   4,000

   Formaldehyde

   50-00-0

   100

   Glyphosate

   1071-83-6

   700

   Gross alpha radionuclides

   15 pCi/L

   Heptachlor

   76-44-8

   0.4

   Heptachlor epoxide

   1024-57-3

   0.2

   Hexachlorobenzene

   118-74-1

   1

   Hexachlorobutadiene

   87-68-3

   0.5

   Hexachlorocyclohexane, alpha

   319-84-6

   0.03

   Hexachlorocyclohexane, beta

   319-85-7

   0.1

   Hexachlorocyclohexane, gamma (Lindane)

   58-89-9

   0.2

   Hexachlorocyclopentadiene

   77-47-4

   50

   Hexachlorodibenzodioxin, 2,3,7,8

   34465-46-8

   0.0221

   Hexachloroethane

   67-72-1

   1

   Indeno(1,2,3-cd)pyrene

   193-39-5

   0.1

   Isophorone

   78-59-1

   100

   Isopropyl benzene

   98-82-8

   800

   Isopropyltoluene, p-

   99-87-6

   260

   Lead

   7439-92-1

   15

   Manganese

   7439-96-5

   300

   Mercury

   7439-97-6

   2

   Methanol

   67-56-1

   4,000

   Methoxychlor

   72-43-5

   40

   Methyl ethyl ketone (MEK)

   78-93-3

   4,000

   Methyl isobutyl ketone (MIBK)

   108-10-1

   2,000

   Methylnaphthalene, 1-

   90-12-0

   160

   Methylnaphthalene, 2-

   91-57-6

   280

   Methyl phenol, 2- (o-cresol)

   95-48-7

   40

   Methyl phenol, 4- (p-cresol)

   106-44-5

   40

   Methyl tertiary-butyl ether (MtBE)

   1634-04-4

   13

   Metolachlor (Dual 8E/25G)

   51218-45-2

   70

   Metribuzin (Sencor 75DF)

   21087-64-9

   70

   Monochlorobenzene (Chlorobenzene)

   108-90-7

   100

   Naphthalene

   91-20-3

   100

   Nickel

   7440-02-0

   100

   Nitrate

   14797-55-8

   10,000

   Nitrite

   14797-65-0

   1,000

   Oxamyl

   23135-22-0

   200

   Pentachlorophenol

   87-86-5

   1

   Perfluorohexane sulfonic acid (PFHxS), total of all isomers

   355-46-4

   0.018

   Perfluorononanoic acid (PFNA), total of all isomers

   375-95-1

   0.011

   Perfluorooctane sulfonic acid (PFOS), total of all isomers

   1763-23-1

   0.015

   Perfluorooctanoic Acid (PFOA), total of all isomers

   335-67-1

   0.012

   Phenanthrene

   85-01-8

   210

   Phenol

   108-95-2

   2,000

   Picloram

   1918-02-1

   500

   Polychlorinated biphenyls (PCBs)

   1336-36-3

   0.5

   Potassium

   7440-09-7

   160,000

   n-Propylbenzene

   103-65-1

   260

   Pyrene

   129-00-0

   210

   Radium 226 and 228

   7740-14-4

   5 pCi/L

   Selenium

   7782-49-2

   50

   Silver

   7440-22-4

   100

   Simazine

   122-34-9

   4

   Strontium 90

   10098-97-2

   8 pCi/L

   Strontium, non-radioactive

   7440-24-6

   4,000

   Styrene

   100-42-5

   100

   Sulfate

   14808-79-8

   500,000

   TCDD, 2,3,7,8- (Dioxin)

   1746-01-6

   0.00003

   Tertiary amyl methyl ether (TAME)

   994-05-8

   140

   Tertiary butyl alcohol (TBA)

   75-65-0

   40

   Tetrachloroethane, 1,1,1,2-

   630-20-6

   70

   Tetrachloroethane, 1,1,2,2,-

   79-34-5

   2

   Tetrachloroethylene (PCE)

   127-18-4

   5

   Tetrachlorophenol, 2,3,4,6

   58-90-2

   200

   Tetrahydrofuran

   109-99-9

   600

   Thallium

   7440-28-0

   2

   Toluene

   108-88-3

   1,000

   Total Coliform

   -

   CTS/100ml

   Toxaphene

   8001-35-2

   3

   2,4,5-TP (Silvex)

   93-72-1

   50

   Trichlorobenzene, 1,2,4-

   120-82-1

   70

   Trichlorobenzene, 1,3,5-

   108-70-3

   40

   Trichloroethane, 1,1,1-

   71-55-6

   200

   Trichloroethane, 1,1,2-

   79-00-5

   5

   Trichloroethylene (TCE)

   79-01-6

   5

   Trichlorofluoromethane

   75-69-4

   2,000

   Trichloromethane (Chloroform)

   67-66-3

   70

   Trichlorophenol, 2,4,5-

   95-95-4

   700

   Trichlorophenol, 2,4,6-

   88-06-2

   5

   Trichloropropane, 1,2,3-

   96-18-4

   0.5

   Trimethylbenzene, 1,2,4-

   95-63-6

   330

   Trimethylbenzene, 1,3,5-

   108-67-8

   330

   Tritium

   10028-17-8

   20,000 pCi/L

   Vinyl chloride

   75-01-4

   2

   Xylenes (mixed isomers)

   1330-20-7

   10,000

Source. (See Revision Note at chapter heading for Env-Or 600) #8812, eff 2-1-07; amd by #9213, eff 7-23-08; ss by #10831, eff 6-1-15; amd by #11112, EMERGENCY RULE, eff 5-31-16, EXPIRES: 11-27-16; amd by #12008, eff 10-22-16; amd by #12554, eff 9-1-18; amd by #12837, eff 9-30-19; amd by #13044-A, eff 5-28-20; amd by #13147, eff 1-1-21