Code of Maine Rules › 10 - DEPARTMENT OF HEALTH AND HUMAN SERVICES › 144 - DEPARTMENT OF HEALTH AND HUMAN SERVICES - GENERAL › Chapter 231 - RULES RELATING TO DRINKING WATER › Appendix 144-231-A - MAXIMUM CONTAMINANT LEVELS FOR BOTTLED WATER FACILITIES

Current through 2024-29, July 17, 2024
Untreated water samples must be analyzed, (prior to the
				  Department's source approval), by a laboratory certified by the State of Maine,
				  for the following contaminants. These contaminants and corresponding maximum
				  contaminant levels and maximum exposure guidelines are regulated by the
				  Department.
1.
MICROORGANISMS
CONTAMINANT
MAXIMUM CONTAMINANT LEVEL (MCL)/
ACTION LEVEL (AL) / TREATMENT TECHNIQUE (TT)
Total Coliform (
E. coli
required if
							 Total Coliform results are positive)
Absent/Present
Turbidity
TT: Conventional/Direct Filtration - 1NTU ([GREATOR
							 THAN EQUAL TO] 0.3 NTU or 95% of samples/ month) Other Filtration - 5
							 NTU
2.
INORGANIC CHEMICALS
CONTAMINANT
MCL / AL / TT
Antimony
0.006 milligrams (mg)/liter (L)
Arsenic
0.010 mg/L
Barium
2 mg/L
Beryllium
0.004 mg/L
Cadmium
0.005 mg/L
Chromium (Total)
0.1 mg/L
Copper
AL: 1.3 mg/L
Fluoride
4.0 mg/L
Lead
AL: 0.015 mg/L
Mercury
0.002 mg/L
Nitrates (Measured as Nitrogen)
10 mg/L
Nitrites (Measured as Nitrogen)
1 mg/L
Selenium
0.05 mg/L
Thallium
0.002 mg/L
3.
ORGANIC CHEMICALS
CONTAMINANT
MCL / AL / TREATMENT TECHNIQUE
Acrylamide
TT: 0.05% dosed at 1 mg/L (or equivalent)
Alachlor
0.002 mg/L
Atrazine
0.003 mg/L
Benzene
0.005 mg/L
Benzo(a)pyrene (PAH's)
0.0002 mg/L
Carbofuran
0.04 mg/L
Carbon Tetrachloride
0.005 mg/L
Chlordane
0.002 mg/L
Chlorobenzene
0.1 mg/L
2, 4-D
0.07 mg/L
Dalapon
0.2 mg/L
1, 2-Dibromo-3- chloropropane (DBCP)
0.0002 mg/L
o-Dichlorobenzene
0.6 mg/L
p-Dichlorobenzene
0.075 mg/L
1,2-Dichloroethane
0.005 mg/L
1,1-Dichloroethylene
0.007 mg/L
Cis-1,2-Dichloroethylene
0.07 mg/L
Trans-1,2-Dichloroethylene
0.1 mg/L
Dichloromethane
0.005 mg/L
1,2-Dichloropropane
0.005 mg/L
Di (2-ethylhexyl) adipate
0.4 mg/L
Di (2-ethylhexyl) phthalate
0.006 mg/L
Dinoseb
0.007 mg/L
Dioxin (2,3,7,8-TCDD)
0.00000003 mg/L
Diquat
0.02 mg/L
Endothall
0.1 mg/L
Endrin
0.002 mg/L
Epichlorohydrin
Treatment Technique: 0.01% dosed at 20 mg/L (or
							 equivalent)
Ethylbenzene
0.7 mg/L
Ethylene dibromide
0.00005 mg/L
Glyphosate
0.7 mg/L
Heptachlor
0.0004 mg/L
Heptachlor epoxide
0.0002 mg/L
Hexachlorobenzene
0.001 mg/L
Hexachlorocyclopentadiene
0.05 mg/L
Hexazanone (Velpar)
200 parts per billion (ppb)
Lindane
0.0002 mg/L
Methoxychlor
0.04 mg/L
MTBE
35 ppb
Oxamyl (Vydate)
0.2 mg/L
Polychlorinated biphenyls (PCBs)
0.0005 mg/L
Pentachlorophenol
0.001 mg/L
Picloram
0.5 mg/L
Simazine
0.004 mg/L
Styrene
0.1 mg/L
Toluene
1 mg/L
Toxaphene
0.003 mg/L
2,4,5 - TP (Silvex)
0.05 mg/L
1,2,4- Trichlorobenzene
0.07 mg/L
1,1,1-Trichloroethane
0.2 mg/L
1,1,2-Trichloroethane
0.005 mg/L
Trichloroethylene
0.005 mg/L
Vinyl chloride
0.002 mg/L
Xylenes (total)
10 mg/L
4.
RADIONUCLIDES
CONTAMINANT
MAXIMUM CONTAMINANT LEVEL ACTION LEVEL /
TREATMENT TECHNIQUE
Gross Alpha
15 Picocuries/Liter (pCi/L)
Uranium
30 ug/L
Radium (Combined)
5 pCi/L
Radon
4,000 Pci/L
2. The Department may modify the list of required water
				  quality test parameters prior to approval, if it determines that the testing
				  schedule required will insure that the well can produce safe and potable water,
				  or, otherwise, for the protection of public health.