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Tap water quality report

Holbrook, AZ

EPA monitoring detected 10 contaminants across the 3 water suppliers serving Holbrook. 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.

3
water suppliers
6,675
people served
10
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Holbrook'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
Fluoride
417 µg/L 10%
of the EPA limit 4000 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2018
1/3 SYR4
Copper
140 µg/L 11%
of the EPA limit 1300 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2019
Highest in the city: 190 µg/L — HOLBROOK SDA INDIAN SCHOOL · 100 people · 2019
2/3 SYR4
Lead
9.24 µg/L 62%
of the EPA limit 15 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2019
Highest in the city: 34.5 µg/L — HOLBROOK SDA INDIAN SCHOOL · 100 people · 2019
2/3 SYR4
Barium
23.4 µg/L 1.2%
of the EPA limit 2000 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2018
2/3 SYR4
Lithium
18 µg/L
No EPA limit set
Main supplier: HOLBROOK CITY OF · 4,833 people · 2025
1/3 UCMR-5
TTHM
8.625 µg/L 11%
of the EPA limit 80 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2019
1/3 SYR4
2,4-D
2.1 µg/L 3%
of the EPA limit 70 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2019
1/3 SYR4
Total Haloacetic Acids (HAA5)
1.84 µg/L 3.1%
of the EPA limit 60 µg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2019
1/3 SYR4
Combined Radium (-226 And -228)
1.6 pCi/L 32%
of the EPA limit 5 pCi/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2018
1/3 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: HOLBROOK CITY OF · 4,833 people · 2025
Highest in the city: 0.0019 mg/L — HOLBROOK SDA INDIAN SCHOOL · 100 people · 2025
3/3 LCR
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 Holbrook

SupplierPopulation served
HOLBROOK CITY OF 4,833
PETRIFIED FOREST NP 1,742
HOLBROOK SDA INDIAN SCHOOL 100

Frequently asked questions about Holbrook tap water

Is Holbrook tap water safe to drink?

EPA testing detected 10 contaminants in the water serving Holbrook. 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 Holbrook?

3 public water suppliers report drinking-water monitoring for Holbrook, Arizona to the EPA. Each is listed above with its population served.

What contaminants are in Holbrook's water?

The contaminants EPA monitoring detected in Holbrook include Fluoride, Copper, Lead, Barium, Lithium. 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.