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Federal water data

County water report

Sullivan County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Sullivan County, New York.

Water grade

F

Water score

24.5

State rank

#45

of 57

Health violations

45

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

10

5,315 recent measurements

Live streamflow

175%

DELAWARE R ABOVE LACKAWAXEN R NEAR BARRYVILLE NY

Water at a glance

Key Water Indicators for Sullivan County

EPA SDWIS

Safety Grade

F

Score: 24.5 / 100

EPA SDWIS

Active Violations

45

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

175% of mean

DELAWARE R ABOVE LACKAWAXEN R NEAR BARRYVILLE NY

EPA WQP

Monitoring Sites

10

5,315 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

24.5/100

Health violations

45

Health-based violations

Violations per 100K served

92.9

Population-normalized SDWIS rate

Editorial analysis

Understanding Sullivan County’s Water

Drinking Water Quality Overview

EPA SDWIS

Sullivan County's water systems carry a failing grade, scoring 24.5 out of 100. Over the past five years, EPA SDWIS records 45 health-based violations — a pattern that public water utilities are required to disclose and correct.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T14:00:00.000-05:00) puts DELAWARE R ABOVE LACKAWAXEN R at 5.9k cfs — running significantly above its long-term average at 175% of mean flow. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Sullivan County has moderate coverage with 10 active monitoring sites with 5,315 recent measurements on record. Predominant monitoring categories include physical and nutrient. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for Sullivan County

Water Verdict

Sullivan County receives a poor water quality assessment with a grade of F and a score of 24.5 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans.

Violation Context

Sullivan County has recorded 45 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 92.9 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Sullivan County has a Grade F compliance record with 45 health-based violations — among the highest levels in the country. Sullivan County's drinking-water compliance score is 24.5 out of 100. The violation rate for Sullivan County is 92.9 per 100,000 people served. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the New York Department of Environmental Quality or Health can expedite utility compliance action. There are 10 active water-quality monitoring sites in Sullivan County. A pipeline streamflow snapshot from the DELAWARE R ABOVE LACKAWAXEN R gauge is also available on this page.

Regional Context

Sullivan County has poorer water quality than the average county in New York. Its water score is 15.6 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in Sullivan County's water environment

Official EPA Resources for Sullivan County

EPA How's My Waterway

Interactive watershed health data for Sullivan County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Sullivan County

Consumer Confidence Reports (NY)

Annual water quality reports from utilities in New York

Past 5 years

Water Quality Monitoring

Monitoring Sites

10

Active in the past 5 years

Measurements Recorded

5.3K

5,315 total readings

Most Measured

  • Physical
  • Nutrient
  • 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

5,860cfs

May 14, 7:00 PM UTC

vs Long-Term Average

175%

Well above typical

Primary Streamgage

DELAWARE R ABOVE LACKAWAXEN R NEAR BARRYVILLE NY

USGS site
01428500
Drainage area
2,020 sq mi
Long-term mean
3,351 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; the percent-of-typical value compares the latest reading against that average.

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Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Sullivan County:F — Failing

High violation count or severe watershed conditions.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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Frequently Asked Questions

What is the water quality in Sullivan County, New York?
Sullivan County, New York has a drinking-water quality grade of F with a score of 24.5/100, based on EPA SDWIS compliance data. The county has 45 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Sullivan County?
Sullivan County has 45 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 Sullivan County?
EPA's Water Quality Portal records 5,315 measurements from 10 monitoring sites in Sullivan County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, 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 Sullivan County right now?
Sullivan County's primary USGS streamgage on the DELAWARE R ABOVE LACKAWAXEN R has a pipeline snapshot of 5,860 cubic feet per second — 175% of the long-term mean of 3,351.05 cfs. This is well above typical — often a signal of recent precipitation or storm runoff. For the latest gauge feed, visit waterdata.usgs.gov.
How does Sullivan County water compare to the New York average?
Sullivan County's SDWIS water quality score of 24.5/100 is lower than the New York state average of 40.1. The average water quality grade across New York is D, based on data from 57 counties with available SDWIS data.
Is tap water safe to drink in Sullivan County?
Based on EPA SDWIS data, Sullivan County has a water quality grade of F (24.5/100). 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 Sullivan County have so many water violations?
Sullivan County has 45 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 Sullivan County rank for water quality in New York?
Sullivan County ranks #45 out of 57 counties in New York by SDWIS water quality score (1 = best). With a score of 24.5/100, it falls in the bottom 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

Schuyler County

New York

F

24.6

Water score

Columbia County

New York

F

24.0

Water score

Cayuga County

New York

F

25.6

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 Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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