Water Quality Report · Updated May 12, 2026
Houston Water Utilities
Houston Water Utilities delivers tap water graded D (55/100) by TapWaterSafety.org. The utility serves approximately 2,304,000 residents in Houston, Texas using surface water from the Lake Houston/Trinity River. The most significant water quality concerns are: PFAS contamination; Lead detected in source water; Chromium-6 detected. For questions, the utility can be reached at (713) 789-1596.
Is Houston tap water safe to drink?
Houston Water Utilities delivers tap water that earns a grade of D (55/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including pfas contamination.
The utility serves 2,304,000 residents in Houston, drawing from surface water (Lake Houston/Trinity River) 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), Nitrate, Nitrate, Chromium-6 (Hexavalent), Chromium-6 (Hexavalent), Nitrate, Chromium-6 (Hexavalent), 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.
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for Houston Water Utilities.
PFAS contamination
Severe concernPFOA, PFOA detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Lead detected in source water
Severe concernLead detected at 1.19 ppb. EWG considers no level of lead safe; EPA's action level is 15 ppb.
Chromium-6 detected
Moderate concernChromium-6 detected at 0.35 ppb.
Contact Houston Water Utilities
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 Houston
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
NSF/ANSI 53 certified for lead removal
$80-$750NSF 53 is the gold standard certification for lead removal. Required when lead is a documented concern.
Reverse Osmosis
$249-$750Chromium-6 requires reverse osmosis for reliable removal. 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 55/100 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 |
6.97 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2022 | EPA violation |
| PFOA Organic |
5.5 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2024 | EPA violation |
| PFOA Organic |
4.31 ppt | 0.004 | 4 | 100 | 100 | 0.007 | 2023 | EPA violation |
| Haloacetic Acids (HAA5) Disinfection byproduct |
22.2 ppb | 0.1 | 60 | 60 | — | — | 2024 | 222× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
18.5 ppb | 0.1 | 60 | 60 | — | — | 2023 | 185× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
16.4 ppb | 0.1 | 60 | 60 | — | — | 2022 | 164× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
49.6 ppb | 0.6 | 80 | 100 | — | — | 2022 | 83× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
41.2 ppb | 0.6 | 80 | 100 | — | — | 2023 | 69× over |
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
39.7 ppb | 0.6 | 80 | 100 | — | — | 2024 | 66× over |
| Nitrate Inorganic |
2.6 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2024 | 19× over |
| Nitrate Inorganic |
2.59 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2022 | 18× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.35 ppb | 0.02 | — | — | — | 0.02 | 2024 | 18× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.331 ppb | 0.02 | — | — | — | 0.02 | 2022 | 17× over |
| Nitrate Inorganic |
2.29 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 2023 | 16× over |
| Chromium-6 (Hexavalent) Heavy metal |
0.308 ppb | 0.02 | — | — | — | 0.02 | 2023 | 15× over |
| Lead Heavy metal |
1.0 ppb | 0 | 15 | 5 | 10 | 0.2 | 2024 | — |
| Lead Heavy metal |
1.19 ppb | 0 | 15 | 5 | 10 | 0.2 | 2023 | — |
| Lead Heavy metal |
1.25 ppb | 0 | 15 | 5 | 10 | 0.2 | 2022 | — |
| Contaminant | Detected (2024) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
39.7 ppb | 0.6 | 80 | 100 | — | — | 66× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
22.2 ppb | 0.1 | 60 | 60 | — | — | 222× over |
| Lead Heavy metal |
1.0 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.35 ppb | 0.02 | — | — | — | 0.02 | 18× over |
| PFOA Organic |
5.5 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
2.6 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 19× over |
| Contaminant | Detected (2023) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
41.2 ppb | 0.6 | 80 | 100 | — | — | 69× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
18.5 ppb | 0.1 | 60 | 60 | — | — | 185× over |
| Lead Heavy metal |
1.19 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.308 ppb | 0.02 | — | — | — | 0.02 | 15× over |
| PFOA Organic |
4.31 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
2.29 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 16× over |
| Contaminant | Detected (2022) | EWG | EPA | EU DWD | WHO | CA PHG | Status |
|---|---|---|---|---|---|---|---|
| Total Trihalomethanes (TTHMs) Disinfection byproduct |
49.6 ppb | 0.6 | 80 | 100 | — | — | 83× over |
| Haloacetic Acids (HAA5) Disinfection byproduct |
16.4 ppb | 0.1 | 60 | 60 | — | — | 164× over |
| Lead Heavy metal |
1.25 ppb | 0 | 15 | 5 | 10 | 0.2 | — |
| Chromium-6 (Hexavalent) Heavy metal |
0.331 ppb | 0.02 | — | — | — | 0.02 | 17× over |
| PFOA Organic |
6.97 ppt | 0.004 | 4 | 100 | 100 | 0.007 | EPA violation |
| Nitrate Inorganic |
2.59 mg/L | 0.14 | 10 | 11.3 | 11.3 | 10 | 18× 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 Houston Water Utilities's Consumer Confidence Report.
Houston Water Utilities service area
This water system serves 1 community in Harris County, Texas. Click any city for its dedicated tap water quality page.
Find the right filter for Houston water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.