waterbycounty
EPA SDWIS

Cedar County Water Quality

Cedar County, Nebraska

Water Grade

F

Water Score

18.0

Violations

11

State Rank

#75

of 90 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

F

Based on EPA compliance history and violation data

Water Score

18/100

Higher = better quality

Health Violations

11

Health-based violations

Violation Rate

153.4%

Systems with violations

Water Advisory: Cedar County

Water Verdict

Cedar County receives a poor water quality assessment with a grade of F and a score of 18.0 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

Cedar County has recorded 11 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 153.4 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of Cedar 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 11 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

Cedar County has poorer water quality than the average county in Nebraska. Its water score is 40.1 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

80.0%

8 of 10 assessed

High concern

Top Impairment Causes

  • 1

    ESCHERICHIA COLI (E. COLI)

  • 2

    CHLOROPHYLL-A

  • 3

    SELENIUM

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

16

Active in the past 5 years

Measurements Recorded

8.0K

7,976 total readings

Most Measured

  • Physical
  • Nutrient
  • Microbiological

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

65.2cfs

May 14, 6:30 PM UTC

vs Long-Term Average

39%

Well below typical

Primary Streamgage

Bow Creek near Wynot, Nebr.

USGS site
06478522
Drainage area
460 sq mi
Long-term mean
167 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 Cedar County, Nebraska?
Cedar County, Nebraska has a drinking-water quality grade of F with a score of 18.0/100, based on EPA SDWIS compliance data. The county has 11 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 Cedar County?
Cedar County has 11 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 Cedar County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 80.0% of Cedar County's 10 assessed water bodies are classified as impaired (8 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), CHLOROPHYLL-A, SELENIUM. 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 Cedar County?
EPA's Water Quality Portal records 7,976 measurements from 16 monitoring sites in Cedar County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Microbiological. 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 Cedar County right now?
Cedar County's primary USGS streamgage on the Bow Creek is currently reading 65.2 cubic feet per second — 39% of the long-term mean of 166.84 cfs. This is well below typical — often a signal of drought stress on source water. For genuine real-time data, visit waterdata.usgs.gov.
How does Cedar County water compare to the Nebraska average?
Cedar County's SDWIS water quality score of 18.0/100 is lower than the Nebraska state average of 58.1. The average water quality grade across Nebraska is D, based on data from 90 counties with available SDWIS data.
Is tap water safe to drink in Cedar County?
Based on EPA SDWIS data, Cedar County has a water quality grade of F (18.0/100). 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).
Why does Cedar County have so many water violations?
Cedar County has 11 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 Cedar County rank for water quality in Nebraska?
Cedar County ranks #75 out of 90 counties in Nebraska by SDWIS water quality score (1 = best). With a score of 18.0/100, 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

Adams County

Nebraska

F

18.0

Water score

Cherry County

Nebraska

F

17.8

Water score

Antelope County

Nebraska

F

17.1

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.

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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