waterbycounty
EPA SDWIS

York County Water Quality

York County, Maine

Water Grade

D

Water Score

49.6

Violations

24

State Rank

#2

of 16 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

D

Based on EPA compliance history and violation data

Water Score

49.6/100

Higher = better quality

Health Violations

24

Health-based violations

Violation Rate

17.1%

Systems with violations

Water Advisory: York County

Water Verdict

York County receives a below-average water quality assessment with a grade of D and a score of 49.6 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

York County has recorded 24 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 17.1 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of York County are advised to use filtered or bottled water for drinking and cooking until water quality improves. A reverse-osmosis or activated-carbon filter certified to remove the contaminants listed in the utility's Consumer Confidence Report is recommended. With 24 recorded health violations, staying informed about utility communications and boil-water notices is especially important. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.

Regional Context

York County has better water quality than the average county in Maine. Its water score is 19.5 points higher than the state average, indicating stronger water system performance relative to neighboring counties.

Past 5 years

Water Quality Monitoring

Monitoring Sites

64

Active in the past 5 years

Measurements Recorded

17K

16,770 total readings

Most Measured

  • Physical
  • Microbiological
  • Organics, Other

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

118cfs

May 14, 6:45 PM UTC

vs Long-Term Average

62%

Below typical

Primary Streamgage

Mousam River near West Kennebunk, Maine

USGS site
01069500
Drainage area
98.8 sq mi
Long-term mean
189 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges — this view summarizes the primary one. The long-term mean is the full-record annual average; "% of typical" compares the latest reading against that average.

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Frequently Asked Questions

What is the water quality in York County, Maine?
York County, Maine has a drinking-water quality grade of D with a score of 49.6/100, based on EPA SDWIS compliance data. The county has 24 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in York County?
York County has 24 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How much water-quality monitoring happens in York County?
EPA's Water Quality Portal records 16,770 measurements from 64 monitoring sites in York County over the past five years. The most frequently measured characteristic groups are Physical, Microbiological, Organics, Other. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in York County right now?
York County's primary USGS streamgage on the Mousam River is currently reading 118 cubic feet per second — 62% of the long-term mean of 189.26 cfs. Flow is within typical range for this gauge. For genuine real-time data, visit waterdata.usgs.gov.
How does York County water compare to the Maine average?
York County's SDWIS water quality score of 49.6/100 is higher than the Maine state average of 30.1. The average water quality grade across Maine is F, based on data from 16 counties with available SDWIS data.
Is tap water safe to drink in York County?
Based on EPA SDWIS data, York County has a water quality grade of D (49.6/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Why does York County have so many water violations?
York County has 24 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does York County rank for water quality in Maine?
York County ranks #2 out of 16 counties in Maine by SDWIS water quality score (1 = best). With a score of 49.6/100, it falls in the top third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Penobscot County

Maine

D

45.6

Water score

Kennebec County

Maine

D

44.1

Water score

Cumberland County

Maine

D

43.3

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP) — federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS) — continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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