Nueces County Water Quality: 2 Cities Ranked by the Records
Nueces County, Texas: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 2 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest34.7 µg/L
- NUECES COUNTY WCID 334.7 µg/LSample date: 2023-01-30 to 2023-10-23
- CITY OF CORPUS CHRISTI26.2 µg/LSample date: 2023-01-09 to 2023-10-17
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest13.8 gpg
- CITY OF CORPUS CHRISTI13.8 gpgReporting year: 2025
Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest2.38 µg/L
- NUECES COUNTY WCID 32.38 µg/LMonitoring period: 2023–2025
- CITY OF CORPUS CHRISTI1.4 µg/LMonitoring period: 2024–2026 (still open)
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 2 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3.8 ng/L
- CITY OF CORPUS CHRISTI3.8 ng/LSample date: 2023-01-18 to 2023-10-17
- NUECES COUNTY WCID 3Not detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-30 to 2023-10-23
Perfluorobutanoic acid (PFBA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest12 ng/L
- NUECES COUNTY WCID 312 ng/LSample date: 2023-01-30 to 2023-10-23
- CITY OF CORPUS CHRISTI11.5 ng/LSample date: 2023-01-18 to 2023-10-17
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest5.6 ng/L
- CITY OF CORPUS CHRISTI5.6 ng/LSample date: 2023-01-18 to 2023-10-17
- NUECES COUNTY WCID 3Not detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-30 to 2023-10-23
26 PFAS tested, none detected in any systemShow
Tested in these 2 systems: CITY OF CORPUS CHRISTI, NUECES COUNTY WCID 3
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 2 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in Texas1city reports hardness · Corpus Christi, 13.8 gpg
Hard on the USGS scale. An aesthetic measure with no federal health limit.
Hard water explainedLargest water systems
- Corpus ChristiCITY OF CORPUS CHRISTI · TX1780003317,247 served
- RobstownNUECES COUNTY WCID 3 · TX178000514,000 served
Frequently asked
How does Nueces County tap water compare across cities?
PurityMap ranks 2 cities in Nueces County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Corpus Christi's main water system: CITY OF CORPUS CHRISTI · PWSID TX1780003 · Purity Score 97 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Nueces County cities had a PFAS sample above a 2024 EPA limit?
None of the 2 Nueces County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 2.
Is there lead in Nueces County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 2 Nueces County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Have Nueces County water systems had drinking-water violations?
1 city in Nueces County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.
Does Nueces County have hard water?
Hardness is published in utility water-quality reports for 1 Nueces County city on record; the hardest is Corpus Christi at 13.8 grains per gallon. Hardness affects scale and appliances; it is not a health finding.
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