Tap Water Quality Report
Tap water quality in Gilbert, Arizona
Tap water in Gilbert, Arizona receives a grade of F (47/100) from TapWaterSafety.org. It's served by GILBERT, TOWN OF. The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Chromium (hexavalent) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Gilbert's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Gilbert.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 5.38 ppb, 1346x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 26.3 ppb, 438x above the EWG health guideline of 0.06 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 5.88 ppb, 294x above the EWG health guideline of 0.02 ppb.
EPA compliance record
Official U.S. EPA records for GILBERT, TOWN OF (system ID AZ0407092) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Revised Total Coliform Rule | Missed reporting | 07/01/2024 | Open |
| Lead and Copper Rule | Missed testing or reporting | 01/01/2026 | Open |
| Nitrate Rule | Missed testing or reporting | 01/01/2023 | Open |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule | Missed testing or reporting | 11/01/2024 | Open |
| Arsenic Rule | Missed testing or reporting | 07/01/2023 | Open |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 07/01/2023 | Open |
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2021 | Open |
| Surface Water Treatment Rule | Missed testing or reporting | 11/01/2024 | Open |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 04/01/2024 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Gilbert
Filters matched to the specific contaminants in Gilbert's 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 arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Gilbert's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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 |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
5.38 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1346× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
26.3 ppb | 0.06 | — | — | — | — | — | 438× over |
| Chromium (hexavalent) Heavy metal |
5.88 ppb | 0.02 | — | — | — | — | — | 294× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
33.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 225× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
10.8 ppb | 0.1 | 60.0 | 60 | — | — | — | 108× over |
| Bromate Disinfection byproduct |
3.4 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 34× over |
| Nitrate Inorganic |
4.34 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 31× over |
| Nitrate and nitrite Inorganic |
3.45 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Uranium Radiological |
1.66 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 3.9× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.163 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 1.8× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.385 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 1.3× over |
| Radium, combined (-226 and -228) Radiological |
0.06 pCi/L | 0.05 | 5.0 | — | — | — | — | 1.2× over |
| Vanadium Other |
8.36 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Cadmium Heavy metal |
0.0123 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | Below guideline |
| Chlorate Disinfection byproduct |
33.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.00607 ppb | 0.06 | 5.0 | — | — | — | — | Below guideline |
| Barium Heavy metal |
49.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
2.32 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.471 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Manganese Heavy metal |
1.4 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Mercury (inorganic) Heavy metal |
0.00875 ppb | 1.2 | 2.0 | 1 | 6 | 1.2 | — | Below guideline |
| Dichloromethane (methylene chloride) Volatile organic compound |
0.0282 ppb | 4.0 | 5.0 | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.72 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| 2,4-D Pesticide/Herbicide |
0.0108 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.753 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.27 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.24 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.11 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Xylenes (total) Volatile organic compound |
0.00885 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
8.54 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.595 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.486 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
167.1 ppb | — | — | — | — | — | — | Below guideline |
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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from GILBERT, TOWN OF.