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Tap water quality report

Mesa, AZ

EPA monitoring detected 25 contaminants across the 1 water supplier serving Mesa. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
466,000
people served
25
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Mesa's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
6293.47 µg/L 63%
of the EPA limit 10000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Nitrate-Nitrite
3835 µg/L 38%
of the EPA limit 10000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2016
1/1 SYR4
Fluoride
859.6 µg/L 21%
of the EPA limit 4000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Lithium
525 µg/L
No EPA limit set
Main supplier: MESA CITY OF · 466,000 people · 2025
1/1 UCMR-5
Chlorite
468.8 µg/L 47%
of the EPA limit 1000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Copper
150 µg/L 12%
of the EPA limit 1300 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2018
1/1 SYR4
Barium
102.45 µg/L 5.1%
of the EPA limit 2000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
TTHM
76.375 µg/L 95%
of the EPA limit 80 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
29 µg/L 48%
of the EPA limit 60 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Bromate
28.29 µg/L 283%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Chromium
19.2718 µg/L 19%
of the EPA limit 100 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Arsenic
11 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Lead
8.824 µg/L 59%
of the EPA limit 15 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2018
1/1 SYR4
Antimony, Total
2.83 µg/L 47%
of the EPA limit 6 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Selenium
2.2988 µg/L 4.6%
of the EPA limit 50 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
1.36 pCi/L 27%
of the EPA limit 5 pCi/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Tetrachloroethylene
1.205 µg/L 24%
of the EPA limit 5 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Dichloromethane
0.9200 µg/L 18%
of the EPA limit 5 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
Gross Alpha, Excl. Radon And U
0.8000 pCi/L 5.3%
of the EPA limit 15 pCi/L
Main supplier: MESA CITY OF · 466,000 people · 2015
1/1 SYR4
Trichloroethylene
0.6730 µg/L 13%
of the EPA limit 5 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.0489 µg/L 24%
of the EPA limit 0.2000 µg/L
Main supplier: MESA CITY OF · 466,000 people · 2019
1/1 SYR4
PFBS
0.0152 µg/L
No EPA limit set
Main supplier: MESA CITY OF · 466,000 people · 2025
1/1 UCMR-5
PFHXS
0.0093 µg/L
No EPA limit set
Main supplier: MESA CITY OF · 466,000 people · 2025
1/1 UCMR-5
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: MESA CITY OF · 466,000 people · 2024
1/1 LCR
Pfhxa
0.0032 µg/L
No EPA limit set
Main supplier: MESA CITY OF · 466,000 people · 2025
1/1 UCMR-5
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Mesa

SupplierPopulation served
MESA CITY OF 466,000

Frequently asked questions about Mesa tap water

Is Mesa tap water safe to drink?

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

How many water suppliers serve Mesa?

1 public water supplier report drinking-water monitoring for Mesa, Arizona to the EPA. Each is listed above with its population served.

What contaminants are in Mesa's water?

The contaminants EPA monitoring detected in Mesa include Nitrate, Nitrate-Nitrite, Fluoride, Lithium, Chlorite. The full list, with the level at the main supplier and the data source, is in the table above.

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.