Water Quality Report · Updated May 12, 2026
GILBERT, TOWN OF
GILBERT, TOWN OF delivers tap water graded F (47/100) by TapWaterSafety.org. The utility serves approximately 247,600 residents in GILBERT, Arizona using surface water. 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. For questions, the utility can be reached at 480-503-6387.
Is GILBERT tap water safe to drink?
GILBERT, TOWN OF delivers tap water that earns a grade of F (47/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 247,600 residents in GILBERT, drawing from surface water.
Public testing data identifies 12 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA9), Chromium (hexavalent), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Bromate, Nitrate, Nitrate and nitrite, Uranium, Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Radium, combined (-226 and -228). 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 GILBERT residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for GILBERT, TOWN OF.
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.
Contact GILBERT, TOWN OF
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for GILBERT
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.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
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 47/100 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 |
|---|---|---|---|---|---|---|---|---|
| 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
GILBERT, TOWN OF service area
This water system serves 1 community in Maricopa County, Arizona. Click any city for its dedicated tap water quality page.
Find the right filter for GILBERT water
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