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Federal water data

County water report

Natrona County Water Report

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

Water grade

D

Water score

43.6

State rank

#10

of 23

Health violations

20

EPA SDWIS, 5-year lookback

Watershed impaired

0.0%

1 water bodies assessed

Monitoring sites

5

3,773 recent measurements

Live streamflow

No gauge

NORTH PLATTE RIVER BELOW CASPER, WY

Water at a glance

Key Water Indicators for Natrona County

EPA SDWIS

Safety Grade

D

Score: 43.6 / 100

EPA SDWIS

Active Violations

20

5-year health-based lookback

EPA ATTAINS

Watershed Health

0% impaired

1 bodies assessed

USGS NWIS

Streamflow Snapshot

No gauge

NORTH PLATTE RIVER BELOW CASPER, WY

EPA WQP

Monitoring Sites

5

3,773 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

D

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

43.6/100

Health violations

20

Health-based violations

Violations per 100K served

26.1

Population-normalized SDWIS rate

Editorial analysis

Understanding Natrona County’s Water

Drinking Water Quality Overview

EPA SDWIS

Natrona County's drinking water received a D grade, scoring 43.6 out of 100. Over the past five years, EPA SDWIS records 20 health-based violations — a pattern that public water utilities are required to disclose and correct.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). None of the assessed waterways are listed as impaired (0 of 1 water bodies) across Natrona County's watersheds. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Natrona County has limited coverage with 5 active monitoring sites with 3,773 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 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 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Natrona County's drinking-water compliance is below average with a Grade D, indicating repeated or unresolved violations in the recent record. Natrona County's drinking-water compliance score is 43.6 out of 100. The violation rate for Natrona County is 26.1 per 100,000 people served. Residents are encouraged to use an NSF 53 or NSF 58-certified filter for drinking and cooking water until the underlying violations are resolved. Running tap water for 30 seconds before use and avoiding older lead-pipe connections can also reduce exposure risk. The current Consumer Confidence Report from your utility will specify the contaminants of concern. There are 5 active water-quality monitoring sites in Natrona County. A pipeline streamflow snapshot from the NORTH PLATTE RIVER BELOW CASPER, WY gauge is also available on this page.

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.

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 Natrona County's water environment

Official EPA Resources for Natrona County

EPA How's My Waterway

Interactive watershed health data for Natrona County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Natrona County

Consumer Confidence Reports (WY)

Annual water quality reports from utilities in Wyoming

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 the assessed water bodies in this county.

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).

Free tool

Estimate Your Water Costs

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 Natrona County:C — Moderate

Some violations or watershed impairment detected.

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 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 streamflow snapshots 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 and 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 Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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