Section R18-11-406. Numeric Aquifer Water Quality Standards: Drinking Water Protected Use

A.       The aquifer water quality standards in this Section apply to aquifers that are classified for drinking water protected use.

B.       The  following  are  the  aquifer  water  quality  standards   for inorganic chemicals:

Pollutant                                      mg/L)

Antimony                                     0.006

Arsenic                                         0.05

Asbestos                                       7 million fibers/liter (longer than 10 mm)

Barium                                         2

Cadmium	0.005
Chromium	0.1
Cyanide (As Free Cyanide)	0.2
Fluoride	4.0

  

 

Beryllium                                      0.004

Lead                                             0.05

Mercury                                        0.002

Nickel                                          0.1

Nitrate (as N)                              10

Nitrite (as N)                              1

Nitrate and nitrite (as N)             10

Selenium                                       0.05

Thallium                                       0.002

C.      

Pollutant	(mg/L)
Benzene	0.005
Benzo (a) pyrene	0.0002
Carbon Tetrachloride	0.005
o-Dichlorobenzene	0.6
para-Dichlorobenzene	0.075
1,2-Dichloroethane	0.005
1,1-Dichloroethylene	0.007
cis-1,2-Dichloroethylene	0.07
trans-1,2-Dichloroethylene	0.1
1,2-Dichloropropane	0.005
Dichloromethane	0.005
Di (2-ethylhexyl) adipate	0.4
Di (2-ethylhexyl) pthalate	0.006
Ethylbenzene	0.7
Hexachlorobenzene	0.001
Hexachlorocyclopentadiene	0.05
Monochlorobenzene	0.1
Pentachlorophenol	0.001
Styrene	0.1
2,3,7,8-TCDD (Dioxin)	0.00000003
Tetrachloroethylene	0.005
Toluene	1
Trihalomethanes (Total)	0.10
1,2,4-Trichlorobenzene	0.07
1,1,1-Trichloroethane	0.20
1,1,2-Trichloroethane	0.005
Trichloroethylene	0.005
Vinyl Chloride	0.002
Xylenes (Total)	10

  

 

The  following  are  the  aquifer  water  quality  standards   for organic chemicals:

D.       The  following   are  the  aquifer  water  quality  standards   for pesticides and polychlorinated biphenyls (PCBs):

Pollutant                                                             (mg/L)

Alachlor                                                              0.002

Atrazine                                                               0.003

Carbofuran                                                           0.04

Chlordane                                                            0.002

Dalapon                                                               0.2

1,2-Dibromo-3-Chloropropane (DBCP)           0.0002

2,4,-Dichlorophenoxyacetic Acid(2,4-D)          0.07

Dinoseb                                                               0.007

Diquat                                                                 0.02

Endothall                                                             0.1

Endrin                                                                 0.002

Ethylene Dibromide (EDB)                               0.00005

Glyphosate                                                           0.7

Heptachlor                                                           0.0004

Lindane	0.0002
Methoxychlor	0.04
Oxamyl	0.2

  

 

Heptachlor Epoxide                                           0.0002

Picloram                                                              0.5

Polychlorinated Biphenols (PCBs)                    0.0005

Simazine                                                              0.004

Toxaphene                                                            0.003

coliforms in a 100-milliliter sample. If a sample is total coliform-positive, a 100-milliliter repeat sample shall be taken within two weeks of the time the sample results are reported. Any total coliform-positive repeat sample following a total coliform-positive sample constitutes a violation of the aquifer water quality standard for microbiological contaminants.

G.  The following are the aquifer water quality standards for turbidity:

1.        One nephelometric turbidity unit as determined by a monthly average except that five or fewer nephelometric turbidity units may be allowed if it can be determined that the higher turbidity does not interfere with disinfection, prevent maintenance of effective disinfectant agents in water supply distribution systems, or interfere with microbiological determinations.

2.        Five nephelometric turbidity units based on an average of two consecutive days.

Historical Note

Adopted effective January 4, 1990 (Supp. 90-1).

Amended effective August 14, 1992 (Supp. 92-3).

Amended effective May 26, 1994 (Supp. 94-2).