Water Quality Report · Updated October 07, 2026
Corpus Christi Municipal Water System
Corpus Christi Municipal Water System delivers tap water graded C (72/100) by TapWaterSafety.org. The utility serves approximately 326,000 residents in Corpus Christi, Texas using surface water from the Choke Canyon/Lake Corpus Christi. The most significant water quality concerns are: PFAS contamination; Chromium-6 detected. For questions, the utility can be reached at (713) 595-8564.
Is Corpus Christi tap water safe to drink?
Corpus Christi Municipal Water System delivers tap water that earns a grade of C (72/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 326,000 residents in Corpus Christi, drawing from surface water (Choke Canyon/Lake Corpus Christi) and disinfecting with chloramine.
Public testing data identifies 18 contaminants in this water above EWG's health-based guidelines, including: PFOA, PFOA, PFOA, Haloacetic Acids (HAA5), Haloacetic Acids (HAA5), Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), Total Trihalomethanes (TTHMs), Total Trihalomethanes (TTHMs), Chromium-6 (Hexavalent), Chromium-6 (Hexavalent), Chromium-6 (Hexavalent), Nitrate, Nitrate, Nitrate, Lead, Lead, Lead. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for Corpus Christi residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for Corpus Christi Municipal Water System.
PFAS contamination
Severe concernPFOA, PFOA detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Chromium-6 detected
Moderate concernChromium-6 detected at 0.14 ppb.
Contact Corpus Christi Municipal Water System
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Water Quality Contact
For questions about contaminants, test results, or your Consumer Confidence Report.
Treatment Plant
Recommended water filters for Corpus Christi
Filters matched to the specific contaminants in this water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Reverse osmosis certified for chromium (NSF/ANSI 58)
$429-$599Chromium-6 needs reverse osmosis for reliable reduction. Standard carbon filters do not address it.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 72/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| PFOA Organic |
6.41 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2023 | EPA violation |
| PFOA Organic |
5.6 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2024 | EPA violation |
| PFOA Organic |
4.44 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2022 | EPA violation |
| Haloacetic Acids (HAA5) Disinfection byproduct |
25.5 ppb | 0.1 | 60 | 60 | — | — | 2024 | 255× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
24.8 ppb | 0.1 | 60 | 60 | — | — | 2022 | 248× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
19.9 ppb | 0.1 | 60 | 60 | — | — | 2023 | 199× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
37.6 ppb | 0.6 | 80 | 100 | — | — | 2022 | 63× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
30.5 ppb | 0.6 | 80 | 100 | — | — | 2024 | 51× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
23.1 ppb | 0.6 | 80 | 100 | — | — | 2023 | 39× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.177 ppb | 0.02 | — | — | — | 0.02 | 2023 | 8.8× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.14 ppb | 0.02 | — | — | — | 0.02 | 2024 | 7.0× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.133 ppb | 0.02 | — | — | — | 0.02 | 2022 | 6.7× over |
| Nitrate Inorganic |
0.8 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2024 | 5.7× over |
| Nitrate Inorganic |
0.759 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2023 | 5.4× over |
| Nitrate Inorganic |
0.608 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2022 | 4.3× over |
| Lead Heavy metal |
0.7 ppb | 0 | 15 | 5 | 10 | 0.2 | 2024 | — |
| Lead Heavy metal |
0.772 ppb | 0 | 15 | 5 | 10 | 0.2 | 2023 | — |
| Lead Heavy metal |
0.802 ppb | 0 | 15 | 5 | 10 | 0.2 | 2022 | — |
| Contaminant | Detected (2024) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
30.5 ppb | 0.6 | 80 | 100 | — | — | 51× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
25.5 ppb | 0.1 | 60 | 60 | — | — | 255× over |
| Lead Heavy metal |
0.7 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.14 ppb | 0.02 | — | — | — | 0.02 | 7.0× over |
| PFOA Organic |
5.6 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
0.8 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 5.7× over |
| Contaminant | Detected (2023) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
23.1 ppb | 0.6 | 80 | 100 | — | — | 39× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
19.9 ppb | 0.1 | 60 | 60 | — | — | 199× over |
| Lead Heavy metal |
0.772 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.177 ppb | 0.02 | — | — | — | 0.02 | 8.8× over |
| PFOA Organic |
6.41 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
0.759 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 5.4× over |
| Contaminant | Detected (2022) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
37.6 ppb | 0.6 | 80 | 100 | — | — | 63× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
24.8 ppb | 0.1 | 60 | 60 | — | — | 248× over |
| Lead Heavy metal |
0.802 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.133 ppb | 0.02 | — | — | — | 0.02 | 6.7× over |
| PFOA Organic |
4.44 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
0.608 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 4.3× over |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database, and Corpus Christi Municipal Water System's Consumer Confidence Report.
Corpus Christi Municipal Water System service area
This water system serves 1 community in Nueces County, Texas. Click any city for its dedicated tap water quality page.
Find the right filter for Corpus Christi water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.