ZipCheckup grade for 78118: A.

The model grade is high, but the records on this page include findings worth reviewing.

Your top priority: match a filter's certification to the violations (5 health-based violations). Check your ZIP → NSF certified filters

Health Violations Found
A 91

Karnes City, TX (78118): 5 Health-Based Violations Recorded for Mapped Water Systems - 91/100

EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: El Oso Water Supply Corporation)

Health Violations Found

Health-based violation records by water system:

EPA records for the water systems mapped to 78118 in Karnes City, TX contain 21 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 5 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
A 91/100
Water Quality Issues 5 health-based violation records
Lead Risk Below action level 0.0014 mg/L, 90th percentile, sample period ending 2023-12-31
NFIP Claim History N/A
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 5 health-based violations and 16 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result of 0.0014 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
  • Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
Contaminant Summary
Health Violations
21 violations 5 health-based
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record
A
ZIP-level Home Safety model score: 91 / 100
Home Safety Score higher than 82% of ZIP codes nationwide
3
Water Systems
6,288
People Served
5
Health Violations (since 2021)Median is 0
Groundwater
Water Source
0.0014 mg/L
Reported Lead Result
Zone 3
County Radon Potential · Low
$115K
Median Home Value41% below state median ($195K)

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Score Breakdown

Overall Home Safety Score: 91/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
48/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
100/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
74/100
Indoor environment
100/100
Outdoor environment
100/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (5) CRITICAL

Your Water System

ZIP code 78118 in Karnes City, Texas is mapped to the water system El Oso Water Supply Corporation (EPA ID: TX1280007). This system provides water to approximately 6,288 people from groundwater sources.

There are 3 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
El Oso Water Supply Corporation TX1280007 6,288 Groundwater
City of Karnes City TX1280001 4,269 Groundwater
City of Kenedy TX1280002 6,454 Groundwater

Other Water Quality Reports in Texas

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for El Oso Water Supply Corporation (TX1280007) on EPA.gov.

4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

Compliance History

2021 2022 2023 1 2024 3 2025 1
Health-based (MCL/TT) Other violations

UCMR 5 PFAS monitoring: no reportable detections in available records

Available federal UCMR5 records for water systems mapped to ZIP code 78118 show no PFAS detections among the compounds tested, at the program's reporting levels.

The EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5) required community and non-transient non-community water systems serving 3,300 or more people to test for 29 PFAS compounds and lithium between 2023 and 2025. Systems with no detections at the federal minimum reporting level had no results at or above that reporting level.

📊 EPA UCMR5 · View source →
Environmental Hazards (10) HIGH
Home & Infrastructure (6) MODERATE

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Cost & Community (9) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Protect Your Home in Karnes City

Based on local data for ZIP 78118, these services may benefit homeowners in your area.

Based on local data for your area. Use the tools below to explore your options.

Gutter Installation & Repair

The median home in 78118 was built around 1973. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.

Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home

Estimate Your Home Maintenance Costs

Window Replacement

The median build year of homes in Karnes City is 1973; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.

Typical cost: Window replacement: typically $300–$800 per window installed

Estimate Your Home Maintenance Costs

Roofing Inspection & Repair

Homes built around 1973 may be on their second or third roof. A professional inspection can catch damage before leaks start.

Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500

Estimate Your Home Insurance Needs

Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.

Frequently Asked Questions

Is the tap water in 78118 safe to drink?

EPA SDWIS records 21 violations since 2021 across the water systems mapped to ZIP 78118 (primary system: El Oso Water Supply Corporation), including 5 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 78118's water come from?

The recorded water source for El Oso Water Supply Corporation, a system mapped to ZIP code 78118, is Groundwater. This system serves approximately 6,288 people.

How does Karnes City water compare to the national average?

Karnes City's Home Safety Score ranks better than 82% of U.S. ZIP codes, and at or above 72% within Texas.

How can I get my water tested in Karnes City?

If El Oso Water Supply Corporation supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

Is lead a concern in 78118 tap water?

The Lead and Copper Rule record selected for 78118 reports a 90th-percentile lead result of 0.0014 mg/L for a water system mapped to this ZIP (record date 2023-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 78118?

78118 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in Karnes County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

How to cite this page

APA ZipCheckup. (2026). Karnes City, TX (78118): 5 Health-Based Violations Recorded for Mapped Water Systems - 91/100. https://zipcheckup.com/report/78118/
BibTeX 
@misc{zipcheckup-report-78118,
  author = {{ZipCheckup}},
  title  = {{Karnes City, TX (78118): 5 Health-Based Violations Recorded for Mapped Water Systems - 91/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/78118/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 78118

ZIP Code City, State Distance Grade Violations
78144 Panna Maria, TX 5.1 mi N/A 0
78117 Hobson, TX 5.7 mi A 12
78119 Kenedy, TX 6.6 mi A 33
78113 Falls City, TX 9.5 mi A 11
78151 Runge, TX 11.7 mi N/A 13
78116 Gillett, TX 12.5 mi A 3
78111 Ecleto, TX 14.7 mi N/A 0
78147 Poth, TX 16.3 mi A 7
78145 Pawnee, TX 16.7 mi N/A 0
78141 Nordheim, TX 19.0 mi N/A 10

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2026 Rankings

ZIP 78118 scores in the top tier nationally.

Coverage: 12/17 risk factors Data sources →
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