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Federal water data

County water report

Weston County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Weston County, Wyoming.

Water grade

F

Water score

40.0

State rank

#12

of 23

Health violations

2

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

5

624 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Weston County

EPA SDWIS

Safety Grade

F

Score: 40.0 / 100

EPA SDWIS

Active Violations

2

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

5

624 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.

40.0/100

Health violations

2

Health-based violations

Violations per 100K served

32.3

Population-normalized SDWIS rate

Editorial analysis

Understanding Weston County’s Water

Drinking Water Quality Overview

EPA SDWIS

Weston County's water systems carry a failing grade, scoring 40.0 out of 100. Over the past five years, EPA SDWIS records 2 health-based violations — a small cluster that warrants attention.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Weston County has limited coverage with 5 active monitoring sites with 624 recent measurements on record. Predominant monitoring categories include organics, pesticide and physical. 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 Weston County

Water Verdict

Weston County receives a below-average water quality assessment with a grade of F and a score of 40.0 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Weston County has recorded 2 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 32.3 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Drinking-water compliance in Weston County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Weston County's drinking-water compliance score is 40.0 out of 100. The violation rate for Weston County is 32.3 per 100,000 people served. An NSF 53 or NSF 58-certified filter is recommended for drinking and cooking water. Check the Consumer Confidence Report from your utility to identify the specific contaminants and required corrective actions — utilities are legally required to notify customers of violations. There are 5 active water-quality monitoring sites in Weston County.

Regional Context

Weston County has water quality close to the average county in Wyoming. Its water score is within 3.4 points of the state average, meaning its overall water system performance is broadly representative of Wyoming as a whole.

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 Weston County's water environment

Official EPA Resources for Weston County

EPA How's My Waterway

Interactive watershed health data for Weston County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Weston County

Consumer Confidence Reports (WY)

Annual water quality reports from utilities in Wyoming

Past 5 years

Water Quality Monitoring

Monitoring Sites

5

Active in the past 5 years

Measurements Recorded

624

624 total readings

Most Measured

  • Organics, Pesticide
  • Physical
  • Nutrient

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).

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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 Weston County:D — Poor

Elevated violations or significant watershed impairment.

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 Weston County, Wyoming?
Weston County, Wyoming has a drinking-water quality grade of F with a score of 40.0/100, based on EPA SDWIS compliance data. The county has 2 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 Weston County?
Weston County has 2 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 Weston County?
EPA's Water Quality Portal records 624 measurements from 5 monitoring sites in Weston County over the past five years. The most frequently measured characteristic groups are Organics, Pesticide, Physical, Nutrient. 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.
How does Weston County water compare to the Wyoming average?
Weston County's SDWIS water quality score of 40.0/100 is higher than the Wyoming state average of 36.6. The average water quality grade across Wyoming is F, based on data from 23 counties with available SDWIS data.
Is tap water safe to drink in Weston County?
Based on EPA SDWIS data, Weston County has a water quality grade of F (40.0/100). 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).
Does Weston County have clean drinking water?
Weston County has 2 health-based drinking water violations according to EPA records. With a water quality score of 40.0/100 and grade F, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How does Weston County rank for water quality in Wyoming?
Weston County ranks #12 out of 23 counties in Wyoming by SDWIS water quality score (1 = best). With a score of 40.0/100, it falls in the middle 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

Uinta County

Wyoming

F

40.2

Water score

Big Horn County

Wyoming

F

37.6

Water score

Natrona County

Wyoming

D

43.6

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.

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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