Drinking water quality · 2024
· Verified
What's in Gilbert, AZ tap water
27 contaminants were measured in the Gilbert, AZ water system's 2024 annual report. Each is shown below against its federal limit — 4 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 27
- Over federal limit
- 4
- Approaching the limit
- 0
- Worst contaminant
- Perfluorobutanesulfonic acid
- Service area
- AZ
- Perfluorobutanesulfonic acidPFAS ("forever chemicals") · Reported level25limit 1 · 25.0× the limit
- PFOSPFAS ("forever chemicals") · Reported level9.8 ng/Llimit 4 ng/L · 2.5× the limit
- PFOAPFAS ("forever chemicals") · Reported level7limit 4 · 1.8× the limit
- TOCPhysical & aggregate · Average19.03 %limit 15 % · 1.3× the limit
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds above EPA limits in Gilbert, AZ
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (2.4×)below national p90 (19.900000000000006 ng/L across detecting U.S. systems)
PFOA (Perfluorooctanoic acid)
● Over EPA limit (1.6×)below national p90 (13.649999999999999 ng/L across detecting U.S. systems)
PFBS
● Detected (no federal limit)above national p90 (13.909999999999979 ng/L across detecting U.S. systems)
PFPeA
● Detected (no federal limit)below national p90 (15.95999999999999 ng/L across detecting U.S. systems)
Lithium
● Detected (no federal limit)3.4× the national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PFHxA
● Detected (no federal limit)below national p90 (12.190000000000003 ng/L across detecting U.S. systems)
PFBA
● Detected (no federal limit)below national p90 (18 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Gilbert, AZ's drinking water comes from ground water, drawn from 22 sources.
Source
- WL-55-505650 -
- WL-55-510941 -
- WL-55-521875 -
- WL-55-529938 -
- + 18 more
Treatment
- TP019 - CL2
- TP020 - CL2
- TP021 - CL2, AS
- + 13 more
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
3 contaminants historically over EPA limits in Gilbert, AZ
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
BROMATE worst: 2019 | 0.029 mg/L 2.9× | 0.01 mg/L | '13'14'15'16'17'18'19 |
TTHM worst: 2012 | 0.11 mg/L 1.4× | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2017 | 0.012 mg/L 1.2× near national p90 | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2013 | 0.048 mg/L 80% | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2014 | 8 mg/L 80% | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2014 | 8 mg/L 80% | 10 mg/L | '12'13'14'15'16'18'19 |
EDB worst: 2013 | 0.000022 mg/L within | 0.00005 mg/L | '13 |
RADIUM 226 228 worst: 2015 | 1.8 pCi/L within below national p90 | 5 pCi/L | '13'15'16 |
GROSS ALPHA worst: 2019 | 3.9 pCi/L within | 15 pCi/L | '12'13'14'16'17'18'19 |
FLUORIDE worst: 2012 | 1 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
CHROMIUM worst: 2012 | 0.019 mg/L within above national p90 | 0.1 mg/L | '12'13'15'16'18'19 |
PCE worst: 2019 | 0.00074 mg/L within | 0.005 mg/L | '19 |
DEHP worst: 2018 | 0.00083 mg/L within | 0.006 mg/L | '18 |
DBCP worst: 2013 | 0.000022 mg/L within below national p90 | 0.0002 mg/L | '13 |
BARIUM worst: 2017 | 0.14 mg/L within near national p90 | 2 mg/L | '12'13'14'15'16'17'18'19 |
SELENIUM worst: 2012 | 0.0031 mg/L within | 0.05 mg/L | '12 |
DIQUAT worst: 2012 | 0.00041 mg/L within | 0.02 mg/L | '12 |
TWOFOURD worst: 2019 | 0.00065 mg/L within near national p90 | 0.07 mg/L | '12'19 |
XYLENES TOTAL worst: 2015 | 0.0031 mg/L within | 10 mg/L | '15 |
URANIUM worst: 2016 | 0.0076 ug/L within below national p90 | 30 ug/L | '12'13'14'15'16'17'18'19 |
DALAPON worst: 2013 | 0.0013 ug/L within below national p90 | 200 ug/L | '12'13'19 |
COPPER worst: 2013 | 0.33 mg/L below national p90 | — | '13'16'19 |
LEAD worst: 2013 | 0.01 mg/L | — | '13'16'19 |
Physical & aggregate
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.89 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 9.2 ug/LAverageSystem-wide | 100 ug/LMCL | Within the limit |
| Antimony | 0 mg/LAverageSystem-wide | 0.006 mg/LMCL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | 0.0001 mg/LAverageSystem-wide | 0.005 mg/LMCL | Within the limit |
| Dichloromethane | Not detected mg/LRangeSystem-wide | 0.005 mg/LMCL | None detected |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.083 %AverageSystem-wide | 5 %MCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detected pCi/LRangeSystem-wide | 5 pCi/LMCL | None detected |
People also ask about Gilbert, AZ's water
+Is Gilbert, AZ tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Gilbert, AZ water utility lists 4 contaminants at or above the federal limit: Perfluorobutanesulfonic acid, PFOS, PFOA, and TOC. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Gilbert, AZ tap water?
27 contaminants were measured in Gilbert, AZ's 2024 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and disinfection byproducts. 27 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Gilbert, AZ tap water?
4 contaminants in Gilbert, AZ's 2024 report sit at or above the federal limit: Perfluorobutanesulfonic acid (25.0× the limit); PFOS (2.5× the limit); PFOA (1.8× the limit); TOC (1.3× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Gilbert, AZ tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Perfluorobutanesulfonic acid, at 25.0× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Gilbert, AZ's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Gilbert, AZ's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.