Water Quality: Onset, MA
1 water system • 5,392 people served
Some ConcernsWater Quality Summary
Onset is served by 1 public water system with a combined service population of 5,392 people, and has 30 EPA Safe Drinking Water Act violations on record. Critically, 1 of those are health-based violation, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Onset's violation count is 6% below the national average for Massachusetts. Contaminants associated with violations include E. coli.
Contaminants Found
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Water Systems Serving Onset
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| ONSET FIRE DISTRICTWATER DEPT. | MA4310003 | Groundwater | 5,392 | 30 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Massachusetts
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.