Hardness
Very hard236mg/L as CaCO₃
Utility-reported average
USGS hardness category
About 13.8 grains per gallon. Confirm incoming hardness for softener sizing.
2025View source
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Nueces County Water Quality Report
Showing utility report
Corpus Christi Water
2025 report; each result retains its sampling period
Results for Corpus Christi Water (TX1780003) within Nueces County. Other suppliers and private wells require their own reports or tests.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chloramine
Reported level below MRDL3.33mg/L
Highest average; range 1.37–4.32
MRDL 4 mg/L
2025View source
TTHMs
Below report benchmark47.0µg/L
Highest yearly average (LRAA); range 19.7–61.8
MCL 80 µg/L
2025View source
HAA5
Below report benchmark14.0µg/L
Highest yearly average (LRAA); range 5.4–17.2
MCL 60 µg/L
2025View source
Fluoride
Below report benchmark0.48mg/L
Reported average and maximum
MCL 4 mg/L
2025View source
Lead
90th percentile below action level1.7µg/L
90th percentile; range 0–6.5; no sites above action level
Action level 15 µg/L
Older sampling retained in the 2025 report.
2023View source
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
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The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 236 mg/L as CaCO₃ · Very hard | 2025 |
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The numbers behind your report
Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.
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| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 236 mg/L as CaCO₃Utility-reported average | 2025View source ↗ | Very hard · USGS hardness categoryAbout 13.8 grains per gallon. Confirm incoming hardness for softener sizing. |
| Chloramine | 3.33 mg/LHighest average; range 1.37–4.32 | 2025View source ↗ | Reported level below MRDL · MRDL 4 mg/L |
| TTHMs | 47.0 µg/LHighest yearly average (LRAA); range 19.7–61.8 | 2025View source ↗ | Below report benchmark · MCL 80 µg/L |
| HAA5 | 14.0 µg/LHighest yearly average (LRAA); range 5.4–17.2 | 2025View source ↗ | Below report benchmark · MCL 60 µg/L |
| Fluoride | 0.48 mg/LReported average and maximum | 2025View source ↗ | Below report benchmark · MCL 4 mg/L |
| Lead | 1.7 µg/L90th percentile; range 0–6.5; no sites above action level | 2023View source ↗ | 90th percentile below action level · Action level 15 µg/LOlder sampling retained in the 2025 report. |
| Nitrate | 1.50 mg/LReported average and maximum | 2025View source ↗ | Below report benchmark · MCL 10 mg/L |
| PFAS | Not assessed No complete compound-specific assessment in this guide | Report review: November 2026View source ↗ | No presence or absence conclusion · Separate testing neededThis guide does not classify PFAS as high, low or absent. Consult the original report and compound-specific data. |
ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.
MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.
PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗
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Source water. Surface water from the Choke Canyon/Lake Corpus Christi system, Lake Texana and Colorado River supplies, treated at the O. N. Stevens Water Treatment Plant.
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What this means for your home
Corpus Christi Water reports an average hardness of 236 mg/L as calcium carbonate.
The 2025 report places the reported average in the very hard category. Its disinfection-byproduct values are the highest locational running annual averages, while lead sampling is dated 2023. These results describe Corpus Christi Water, not every Nueces County water provider or private well.
A useful local question
Is Corpus Christi’s water hard enough to consider a softener?
The reported 2025 average of 236 mg/L as calcium carbonate is very hard, about 13.8 grains per gallon. We suggest a softener for scale control alongside filtration matched to chloramine; confirm incoming hardness and household demand for sizing.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
- Corpus Christi Water ↗2025 report; each result retains its sampling period
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked November 14, 2026
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