Excerpt from the Massachusetts Drinking Water Regulations, 310 CMR 22.00. NOTE: This does not constitute an official version of the regulation. See our Important Regulations Disclaimer .


(1) Secondary Contaminants. The following contaminant levels apply to every public water system:

ContaminantSecondary MCL
(a) Aluminum0.05 to 0.2 mg/l
(b) Chloride250 mg/l
(c) Color15 Color Units
(d) Copper1.0 mg/l
(e) CorrosivityNon-corrosive
(f) Fluoride2.0 mg/l
(g) Foaming Agents0.5 mg/l
(h) Iron0.3 mg/l
(i) Manganese0.05 mg/l
(j) Odor3 Threshold Unit Number
(k) pH6.5 - 8.5
(l) Silver0.10 mg/l
(m) Sulfate250 mg/l
(n) Total Dissolved Solids500 mg/l
(o) Zinc5 mg/l

(2) Monitoring for Secondary Contaminants: The monitoring frequency for the contaminants listed in 310 CMR 22.07D(1) is at the discretion of the Department.

(3) Exceeding a Secondary Maximum Contaminant Level: If the Department finds based on a health evaluation by the Department's Office of Research and Standards, that an SMCL exceedance, acting alone or in combination with other contaminants, poses an unacceptable health risk to consumers, the public water system shall take all actions necessary to reduce the SMCL concentrations to levels the Department deems safe by the deadline specified by the Department. Such public water system shall also monitor the water and provide public notice as directed by the Department and notify the Department in writing of its proposed actions.

(4) The analytical methods for Secondary Contaminants are available in the Federal Register/Vol. 72, No. 47 /March 12, 2007 (PDF - opens in new window).