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Tap water quality report

Tempe City of

EPA monitoring tested this supplier for 104 contaminants and detected 29. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
29
detected
165,000
people served
6
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.

6
health-based violations
334
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2017-10-01
TT Health-based Resolved 2017-10-01
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MR Monitoring Resolved 2018-01-01 → 2018-03-31
MR Monitoring Resolved 2018-01-01 → 2018-03-31
MR Monitoring Resolved 2018-01-01 → 2018-12-31
MR Monitoring Resolved 2018-01-01 → 2018-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0257 µg/L 16/24 2025
PFOS 0.0558 µg/L 10/24 2025
PFHXS 0.0705 µg/L 8/24 2025
PFOA 0.0387 µg/L 8/24 2025
Pfhxa 0.0225 µg/L 6/24 2025
Pfpea 0.0144 µg/L 6/24 2025
Pfhpa 0.0070 µg/L 4/24 2025
Pfba 0.0099 µg/L 3/24 2025
Pfpes 0.0080 µg/L 2/24 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
Copper
330 µg/L 25%
of the EPA limit 1300 µg/L
worst single sample: 1500 µg/L
364/377 SYR4 2012–2019
Nitrate
6800 µg/L 68%
of the EPA limit 10000 µg/L
worst single sample: 8800 µg/L
288/306 SYR4 2012–2019
TTHM
79 µg/L 99%
of the EPA limit 80 µg/L
worst single sample: 120 µg/L
284/284 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
26.65 µg/L 44%
of the EPA limit 60 µg/L
worst single sample: 44 µg/L
250/260 SYR4 2012–2019
Lead
24.6 µg/L 164%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 760 µg/L
188/377 SYR4 2012–2019
Arsenic
5.73 µg/L 57%
of the EPA limit 10 µg/L
worst single sample: 11 µg/L
88/94 SYR4 2012–2019
Fluoride
473 µg/L 12%
of the EPA limit 4000 µg/L
worst single sample: 810 µg/L
75/75 SYR4 2012–2019
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
worst single sample: 140 µg/L
73/74 SYR4 2012–2019
Chromium
11.3 µg/L 11%
of the EPA limit 100 µg/L
worst single sample: 19 µg/L
48/74 SYR4 2012–2019
Nitrate-Nitrite
6540 µg/L 65%
of the EPA limit 10000 µg/L
worst single sample: 8600 µg/L
39/41 SYR4 2012–2017
Combined Uranium
11.1682 µg/L 37%
of the EPA limit 30 µg/L
worst single sample: 12.5 µg/L
35/36 SYR4 2014–2018
Selenium
2.045 µg/L 4.1%
of the EPA limit 50 µg/L
worst single sample: 2.1 µg/L
32/74 SYR4 2012–2019
Lithium
278 µg/L
No EPA limit set
 24/24 UCMR-5 2025
Gross Alpha, Excl. Radon And U
2.58 pCi/L 17%
of the EPA limit 15 pCi/L
worst single sample: 3 pCi/L
23/36 SYR4 2014–2018
Lead
0.0044 mg/L 29%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2024
Combined Radium (-226 And -228)
1.14 pCi/L 23%
of the EPA limit 5 pCi/L
worst single sample: 1.2 pCi/L
13/35 SYR4 2014–2018
Tetrachloroethylene
0.8400 µg/L 17%
of the EPA limit 5 µg/L
worst single sample: 0.9300 µg/L
10/96 SYR4 2012–2019
Trichloroethylene
0.9780 µg/L 20%
of the EPA limit 5 µg/L
worst single sample: 1.02 µg/L
5/106 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
0.7100 µg/L 12%
of the EPA limit 6 µg/L
 1/69 SYR4 2012–2019
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
 1/74 SYR4 2012–2019
75 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTolueneToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HOPPES, CHRISTINA
Phone
480-350-8255
Email
[email protected]

Frequently asked questions about Tempe City of

Is Tempe City of tap water safe to drink?

EPA monitoring detected 29 contaminants in Tempe 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 Tempe City of's water?

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

How many people does Tempe City of serve?

Tempe City of reports serving 165,000 people in Arizona, per its EPA record.

Has Tempe City of had any water quality violations?

The EPA has 334 violations on file for Tempe City of, of which 6 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.