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Tap water quality report

Mesa City of

EPA monitoring tested this supplier for 104 contaminants and detected 25. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
25
detected
466,000
people served
3
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Surface water
Ownership
Local government
Counties served
Maricopa

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
1,723
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Archived 1981-11-20 → 1981-12-19
MCL Health-based Archived 1981-04-24 → 1981-05-23
MON Monitoring Resolved 2025-08-01 → 2025-08-31
MON Monitoring Resolved 2025-08-01 → 2025-08-31
MR Monitoring Resolved 2025-03-01 → 2025-03-31
MR Monitoring Resolved 2025-03-01 → 2025-03-31
MR Monitoring Resolved 2025-03-01 → 2025-03-31
MR Monitoring Resolved 2025-02-01 → 2025-02-28
MR Monitoring Resolved 2025-02-01 → 2025-02-28

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0152 µg/L 10/70 2025
PFHXS 0.0093 µg/L 4/70 2025
Pfhxa 0.0032 µg/L 1/70 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
6293.47 µg/L 63%
of the EPA limit 10000 µg/L
worst single sample: 7560 µg/L
508/520 SYR4 2012–2019
TTHM
76.375 µg/L 95%
of the EPA limit 80 µg/L
worst single sample: 104 µg/L
366/371 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
29 µg/L 48%
of the EPA limit 60 µg/L
worst single sample: 44 µg/L
341/372 SYR4 2012–2019
Chlorite
468.8 µg/L 47%
of the EPA limit 1000 µg/L
worst single sample: 1513 µg/L
195/226 SYR4 2012–2019
Copper
150 µg/L 12%
of the EPA limit 1300 µg/L
worst single sample: 381 µg/L
154/154 SYR4 2012–2018
Arsenic
11 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 13 µg/L
128/135 SYR4 2012–2019
Barium
102.45 µg/L 5.1%
of the EPA limit 2000 µg/L
worst single sample: 130 µg/L
112/112 SYR4 2012–2019
Chromium
19.2718 µg/L 19%
of the EPA limit 100 µg/L
worst single sample: 23 µg/L
103/112 SYR4 2012–2019
Fluoride
859.6 µg/L 21%
of the EPA limit 4000 µg/L
worst single sample: 1187.46 µg/L
90/110 SYR4 2012–2019
Lead
8.824 µg/L 59%
of the EPA limit 15 µg/L
worst single sample: 41.7 µg/L
73/154 SYR4 2012–2018
Lithium
525 µg/L
No EPA limit set
 70/70 UCMR-5 2025
Selenium
2.2988 µg/L 4.6%
of the EPA limit 50 µg/L
worst single sample: 2.9693 µg/L
40/112 SYR4 2012–2019
Nitrate-Nitrite
3835 µg/L 38%
of the EPA limit 10000 µg/L
worst single sample: 6600 µg/L
34/34 SYR4 2012–2016
Tetrachloroethylene
1.205 µg/L 24%
of the EPA limit 5 µg/L
worst single sample: 1.3 µg/L
20/161 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2024
1,2-DIBROMO-3-CHLOROPROPANE
0.0489 µg/L 24%
of the EPA limit 0.2000 µg/L
worst single sample: 0.0510 µg/L
8/136 SYR4 2012–2019
Trichloroethylene
0.6730 µg/L 13%
of the EPA limit 5 µg/L
worst single sample: 0.7000 µg/L
7/155 SYR4 2012–2019
Combined Radium (-226 And -228)
1.36 pCi/L 27%
of the EPA limit 5 pCi/L
worst single sample: 1.5 pCi/L
5/108 SYR4 2012–2019
Bromate
28.29 µg/L 283%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 30 µg/L
4/20 SYR4 2018–2019
Antimony, Total
2.83 µg/L 47%
of the EPA limit 6 µg/L
 1/112 SYR4 2012–2019
Dichloromethane
0.9200 µg/L 18%
of the EPA limit 5 µg/L
 1/155 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
0.8000 pCi/L 5.3%
of the EPA limit 15 pCi/L
 1/1 SYR4 2015
79 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CALLES, JENNIFER
Phone
480-644-3890
Email
[email protected]

Frequently asked questions about Mesa City of

Is Mesa City of tap water safe to drink?

EPA monitoring detected 25 contaminants in Mesa City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Mesa City of's water?

EPA monitoring detected Nitrate, TTHM, Total Haloacetic Acids (HAA5), Chlorite, Copper, and others. The full list with the level and data source for each is above.

How many people does Mesa City of serve?

Mesa City of reports serving 466,000 people in Arizona, per its EPA record.

Has Mesa City of had any water quality violations?

The EPA has 1723 violations on file for Mesa City of, of which 3 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.