Tap WaterIndex

← Arizona

Tap water quality report

Flagstaff City of

EPA monitoring tested this supplier for 104 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
16
detected
79,796
people served
7
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Surface water
Ownership
Local government
Counties served
Coconino

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.

7
health-based violations
1,036
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-07-01 → 2015-09-30
TT Health-based Resolved 2003-09-01 → 2003-09-30
TT Health-based Resolved 2003-03-01 → 2003-03-31
TT Health-based Resolved 2002-08-01 → 2002-08-31
TT Health-based Resolved 2000-02-01 → 2000-02-29
MCL Health-based Archived 1981-02-06 → 1981-05-05
MCL Health-based Archived 1980-05-20 → 1980-07-19
RPT Monitoring Resolved 2025-07-01
RPT Monitoring Resolved 2025-07-01
MR Monitoring Resolved 2025-06-01 → 2025-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0061 µg/L 1/24 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
TTHM
65.35 µg/L 82%
of the EPA limit 80 µg/L
worst single sample: 100 µg/L
252/269 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
55.8 µg/L 93%
of the EPA limit 60 µg/L
worst single sample: 96 µg/L
225/269 SYR4 2012–2019
Nitrate
1500 µg/L 15%
of the EPA limit 10000 µg/L
worst single sample: 1900 µg/L
142/158 SYR4 2012–2019
Chlorite
354 µg/L 35%
of the EPA limit 1000 µg/L
worst single sample: 480 µg/L
97/162 SYR4 2012–2019
Copper
300 µg/L 23%
of the EPA limit 1300 µg/L
worst single sample: 380 µg/L
62/62 SYR4 2014–2017
Lead
4.64 µg/L 31%
of the EPA limit 15 µg/L
worst single sample: 14 µg/L
47/62 SYR4 2014–2017
Nitrate-Nitrite
1400 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1500 µg/L
39/43 SYR4 2012–2018
Fluoride
193 µg/L 4.8%
of the EPA limit 4000 µg/L
worst single sample: 220 µg/L
19/19 SYR4 2012–2019
Arsenic
6.055 µg/L 61%
of the EPA limit 10 µg/L
worst single sample: 7.5 µg/L
18/19 SYR4 2012–2019
Barium
709 µg/L 35%
of the EPA limit 2000 µg/L
worst single sample: 1100 µg/L
18/19 SYR4 2012–2019
Lead
0.0036 mg/L 24%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Chromium
2.465 µg/L 2.5%
of the EPA limit 100 µg/L
worst single sample: 2.6 µg/L
10/19 SYR4 2012–2019
Combined Uranium
2.574 µg/L 8.6%
of the EPA limit 30 µg/L
worst single sample: 2.8 µg/L
9/11 SYR4 2012–2017
Gross Alpha, Excl. Radon And U
2.61 pCi/L 17%
of the EPA limit 15 pCi/L
worst single sample: 3 pCi/L
7/11 SYR4 2012–2017
Combined Radium (-226 And -228)
1.025 pCi/L 21%
of the EPA limit 5 pCi/L
worst single sample: 1.1 pCi/L
4/11 SYR4 2012–2017
88 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) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MONTOYA, JOLENE
Phone
928-213-2117
Email
[email protected]

Frequently asked questions about Flagstaff City of

Is Flagstaff City of tap water safe to drink?

EPA monitoring detected 16 contaminants in Flagstaff 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 Flagstaff City of's water?

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

How many people does Flagstaff City of serve?

Flagstaff City of reports serving 79,796 people in Arizona, per its EPA record.

Has Flagstaff City of had any water quality violations?

The EPA has 1036 violations on file for Flagstaff City of, of which 7 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.