waterbycounty
EPA SDWIS

San Patricio County Water Quality

San Patricio County, Texas

Water Grade

F

Water Score

23.6

Violations

66

State Rank

#130

of 254 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

F

Based on EPA compliance history and violation data

Water Score

23.6/100

Higher = better quality

Health Violations

66

Health-based violations

Violation Rate

97.7%

Systems with violations

Water Advisory: San Patricio County

Water Verdict

San Patricio County receives a poor water quality assessment with a grade of F and a score of 23.6 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

San Patricio County has recorded 66 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 97.7 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of San Patricio 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 66 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

San Patricio County has poorer water quality than the average county in Texas. Its water score is 6.8 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

Past 5 years

Water Quality Monitoring

Monitoring Sites

4

Active in the past 5 years

Measurements Recorded

816

816 total readings

Most Measured

  • Microbiological
  • 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).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

30.0cfs

May 14, 7:00 PM UTC

vs Long-Term Average

5%

Well below typical

Primary Streamgage

Nueces Rv nr Mathis, TX

USGS site
08211000
Drainage area
16,503 sq mi
Long-term mean
626 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 San Patricio County, Texas?
San Patricio County, Texas has a drinking-water quality grade of F with a score of 23.6/100, based on EPA SDWIS compliance data. The county has 66 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 San Patricio County?
San Patricio County has 66 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 San Patricio County?
EPA's Water Quality Portal records 816 measurements from 4 monitoring sites in San Patricio County over the past five years. The most frequently measured characteristic groups are Microbiological, 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.
What's happening with rivers in San Patricio County right now?
San Patricio County's primary USGS streamgage on the Nueces Rv is currently reading 30 cubic feet per second — 5% of the long-term mean of 626.26 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 San Patricio County water compare to the Texas average?
San Patricio County's SDWIS water quality score of 23.6/100 is lower than the Texas state average of 30.4. The average water quality grade across Texas is F, based on data from 254 counties with available SDWIS data.
Is tap water safe to drink in San Patricio County?
Based on EPA SDWIS data, San Patricio County has a water quality grade of F (23.6/100). 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 San Patricio County have so many water violations?
San Patricio County has 66 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 San Patricio County rank for water quality in Texas?
San Patricio County ranks #130 out of 254 counties in Texas by SDWIS water quality score (1 = best). With a score of 23.6/100, 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

Comal County

Texas

F

23.6

Water score

Randall County

Texas

F

23.0

Water score

Bandera County

Texas

F

24.3

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

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