Is CHELSEA WATER DEPT. (MWRA)'s water safe to drink?
CHELSEA WATER DEPT. (MWRA) has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 40,787 people through 5,100 service connections.
How this compares nationally
CHELSEA WATER DEPT. (MWRA) has 19 violations on record in total, 17 of thems health-based - ranking it 1,111th of 12,903 systems by violation count, the 91th percentile nationally.
Against the MA average
Among the 283 MA systems in this dataset, the average is 7.0 health-based violations - CHELSEA WATER DEPT. (MWRA)'s 17 is above that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
CHELSEA WATER DEPT. (MWRA)'s most recent violation on record is dated 2016-01-07, with the most recent health-based one dated 2010-01-01. Last reported to EPA: 06/22/2026.
The concern categories on record
CHELSEA WATER DEPT. (MWRA)'s flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Lead & copper - flagged from: Lead and Copper Rule
- Microbial contamination / treatment technique - flagged from: Coliform (TCR); Surface Water Treatment Rule
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What CHELSEA WATER DEPT. (MWRA)'s record does not cover
CHELSEA WATER DEPT. (MWRA)'s numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 19 logged violations can see. The guide to what this data misses covers that gap.