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CT State Water Quality Standards

WATER QUALITY MONITORING OF PROPOSED NEW WELLS / SOURCES OF SUPPLY

APPLICABLE REGULATIONS: Sections 19-13-B102(e), 19-13-B37 and 19-13-B51l of the Public Health Code (PHC), as well as Sections 16-262m(b) and 25-33(b) of the Connecticut General Statutes (CGS) all indicate that approval must be obtained from the DPH for any proposed new source of supply. Please refer to Public Health Code Section 19-13-B101 which identifies the monitoring test required for new wells.

WATER QUALITY STANDARDS FOR PRIVATE WELLS

(REF. CT DPH PRIVATE WELL PROGRAM, PUBLICATION NO. 23: PRIVATE DRINKING WATER
STANDARDS, TABLE 1)

A. Bacteriological Standard:
Total Coliform Bacteria Absent/Zero (0) per 100 ml
Fecal Coliform or Escherichia coli Absent/Zero (0) per 100 ml
B. Physical Standard:
Color <15 C.P.U.
Odor <2 Odor Threshold Number
Turbidity <5 NTU
pH 6.4 – 10.0 S.U.
C. Inorganic Chemicals (IOC) MCL or as noted (mg/l):
Iron 0.3 mg/l SMCL
Hardness 150 mg/l
Nitrate-N 10.0 mg/l MCL
Nitrite-N 1 mg/l MCL
Chloride 250 mg/l MCL
Sodium 28 mg/l notification level
Manganese 0.05 mg/l SMCL
Sulfate 250 mg/l SMCL
Lead 0.015 mg/l AL
Fluoride 4.0 mg/
Copper 1.0 SMCL
Arsenic 0.01 mg/l

Abbreviations:

MCL = maximum contaminant level
SMCL = secondary maximum contaminant level
AL = action level
mg/l = milligrams per liter = ppm

For a complete listing of CT DPH Standards reference the CT Department of Public Health Code section 19-13-B102(e) “Public Drinking Water Quality Standards”.

Note: The U.S. Environmental Protection Agency (EPA) does not regulate private wells. Private well owners are responsible for the quality of their own drinking water. Homeowners with private wells are generally not required to test their drinking water. However, they can use the public drinking water standards as guidelines to ensure drinking water quality.