Chelsea, MA water quality
Chelsea, MA is served by 6 public water systems, serving 3,256,447 people combined. Across those systems, we count 0 health-based violations in the last 5 years. The worst Tap Grade among them is A.
Water systems serving Chelsea
MWRA
CHELSEA, MA · 2,580,000 served
BOSTON WATER AND SEWER COMMISSION (MWRA)
BOSTON, MA · 675,647 served
ROCKY MT SPRG @ SUPREME LIQ BOSTON VND
WEYMOUTH, MA · 400 served
DEER ISLAND (MWRA)
CHELSEA, MA · 350 served
ROCKY MT SPRING @ ROSLINDALE PLAZA VND
WEYMOUTH, MA · 25 served
ROCKY MOUNTAIN SPRING WATER VENDING
EAST WEYMOUTH, MA · 25 served
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Is Chelsea, MA tap water safe to drink?
6 public water systems serve Chelsea, MA, with 0 health-based violations in the last 5 years across them. The worst Tap Grade among them is A.
Does Chelsea's water have lead in it?
The most recent 90th-percentile lead sample is 5.9 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in Chelsea's water?
These systems were tested under UCMR5 and no PFAS was detected above the reporting limit in the analytes we track.
Source: EPA SDWIS/ECHO · Data as of 2026Q2