waterbycounty
EPA SDWIS

Natrona County Water Quality

Natrona County, Wyoming

Water Grade

D

Water Score

43.6

Violations

20

State Rank

#10

of 23 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

D

Based on EPA compliance history and violation data

Water Score

43.6/100

Higher = better quality

Health Violations

20

Health-based violations

Violation Rate

26.1%

Systems with violations

Water Advisory: Natrona County

Water Verdict

Natrona County receives a below-average water quality assessment with a grade of D and a score of 43.6 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Natrona County has recorded 20 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 26.1 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of Natrona 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 20 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

Natrona County has better water quality than the average county in Wyoming. Its water score is 7 points higher than the state average, indicating stronger water system performance relative to neighboring counties.

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 1 assessed

Mostly healthy

Top Impairment Causes

No specific impairment causes reported for this county's assessed water bodies.

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state — counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

5

Active in the past 5 years

Measurements Recorded

3.8K

3,773 total readings

Most Measured

  • Physical
  • Nutrient
  • Inorganics, Minor, Metals

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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Frequently Asked Questions

What is the water quality in Natrona County, Wyoming?
Natrona County, Wyoming has a drinking-water quality grade of D with a score of 43.6/100, based on EPA SDWIS compliance data. The county has 20 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 Natrona County?
Natrona County has 20 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 healthy are the watersheds in Natrona County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Natrona County's 1 assessed water bodies are classified as impaired (0 impaired). Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in Natrona County?
EPA's Water Quality Portal records 3,773 measurements from 5 monitoring sites in Natrona County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Inorganics, Minor, Metals. 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 Natrona County water compare to the Wyoming average?
Natrona County's SDWIS water quality score of 43.6/100 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 Natrona County?
Based on EPA SDWIS data, Natrona County has a water quality grade of D (43.6/100). 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 Natrona County have so many water violations?
Natrona County has 20 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 Natrona County rank for water quality in Wyoming?
Natrona County ranks #10 out of 23 counties in Wyoming by SDWIS water quality score (1 = best). With a score of 43.6/100, 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

Sweetwater County

Wyoming

D

43.8

Water score

Hot Springs County

Wyoming

D

44.6

Water score

Laramie County

Wyoming

D

46.7

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.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments — state-reported, EPA-finalized.

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

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