Drinking water quality · 2024
· Verified
What's in Mesa, AZ tap water
22 contaminants were measured in the Mesa, AZ water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 22
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- AZ
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound approaching EPA limits in Mesa, 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.
PFHxS (Perfluorohexane sulfonic acid)
● Approaching limit (93%)near national p90 (12.049999999999997 ng/L across detecting U.S. systems)
Lithium
● Detected (no federal limit)6.9× the national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PFBS
● Detected (no federal limit)above national p90 (13.909999999999979 ng/L across detecting U.S. systems)
PFHxA
● Detected (no federal limit)below national p90 (12.190000000000003 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Mesa, AZ's drinking water comes from ground water, drawn from 33 sources.
Source
- WL-55-629618 - CITY
- WL-55-508798 - CITY
- WL-55-511595 - DESERT
- WL-55-517843 - CITY
- + 29 more
Treatment
- TP001 - CLO2, BROWN CAP
- TP004 - CL2, AS
- TP003 - CL2
- + 3 more
Distribution
Also buys water from PHOENIX CITY OF.
Historical readings · EPA Six-Year Review (2012–2019)
4 contaminants historically over EPA limits in Mesa, 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 | 0.03 mg/L 3.0× | 0.01 mg/L | '19 |
CHLORITE worst: 2018 | 1.51 mg/L 1.5× | 1 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2012 | 0.013 mg/L 1.3× near national p90 | 0.01 mg/L | '12'13'14'15'16'18'19 |
TTHM worst: 2016 | 0.104 mg/L 1.3× | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2015 | 7.56 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2019 | 0.044 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2012 | 6.6 mg/L within | 10 mg/L | '12'15'16 |
ANTIMONY worst: 2019 | 0.00283 mg/L within near national p90 | 0.006 mg/L | '19 |
RADIUM 226 228 worst: 2018 | 1.5 pCi/L within below national p90 | 5 pCi/L | '13'15'17'18 |
FLUORIDE worst: 2019 | 1.19 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
PCE worst: 2013 | 0.0013 mg/L within | 0.005 mg/L | '13'14'15'16'18'19 |
DBCP worst: 2014 | 0.000051 mg/L within below national p90 | 0.0002 mg/L | '13'14'15'16'17'18'19 |
CHROMIUM worst: 2016 | 0.023 mg/L within 2.3× the national p90 | 0.1 mg/L | '12'13'15'16'18'19 |
DICHLOROMETHANE worst: 2019 | 0.00092 mg/L within | 0.005 mg/L | '19 |
TCE worst: 2014 | 0.0007 mg/L within | 0.005 mg/L | '12'14'15'16'17'18'19 |
BARIUM worst: 2016 | 0.13 mg/L within near national p90 | 2 mg/L | '12'13'14'15'16'17'18'19 |
SELENIUM worst: 2019 | 0.00297 mg/L within | 0.05 mg/L | '12'13'14'15'16'17'18'19 |
GROSS ALPHA worst: 2015 | 0.8 pCi/L within | 15 pCi/L | '15 |
COPPER worst: 2012 | 0.293 mg/L below national p90 | — | '12'15'18 |
LEAD worst: 2012 | 0.029 mg/L | — | '12'15'18 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.3 NTUHighest single sampleSystem-wide | 1 NTUTreatment technique | Within the limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.6Running annual avgSystem-wide | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 24.7 ug/LReported levelSystem-wide | 100 ug/LMCL | Within the limit |
| SodiumA naturally occurring salt component. | 210 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0–0.9RangeSystem-wide | 5MCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.71 mg/LRunning annual avgSystem-wide | 4 mg/LMRDL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | 0–0.62 ug/LRangeSystem-wide | 5 ug/LMCL | Within the limit |
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | 0.54 ug/LReported levelSystem-wide | 5 ug/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 4Reported levelSystem-wide | None set | Detected — no federal limit |
People also ask about Mesa, AZ's water
+Is Mesa, AZ tap water safe to drink in 2024?
Every one of the 22 contaminants measured in Mesa, AZ's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Mesa, AZ tap water?
22 contaminants were measured in Mesa, AZ's 2024 Consumer Confidence Report, spanning metals, disinfection byproducts, and vocs & pesticides. 19 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in Mesa, AZ tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Arsenic. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Mesa, 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 Mesa, 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.