What was found in ZIP 85138
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 6600 µg/L 66% of the EPA limit 10000 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019
Highest in the ZIP: 13570 µg/L — COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 5506 µg/L 55% of the EPA limit 10000 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 13455 µg/L — COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 2/3 | SYR4 |
| Fluoride | 2100 µg/L 53% of the EPA limit 4000 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019
Highest in the ZIP: 3074 µg/L — COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 3/3 | SYR4 |
| Lithium | 263 µg/L No EPA limit set Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2024 | 3/3 | UCMR-5 |
| Chromium | 6.97 µg/L 7% of the EPA limit 100 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 260 µg/L — Ak-Chin Village · 11,646 people · 2019 | 3/3 | SYR4 |
| Copper | 142 µg/L 11% of the EPA limit 1300 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 218 µg/L — COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 139.915 pCi/L No EPA limit set Highest in the ZIP: Ak-Chin Village · 11,646 people · 2015 | 1/3 | SYR4 |
| Barium | 68.2 µg/L 3.4% of the EPA limit 2000 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 120 µg/L — Ak-Chin Village · 11,646 people · 2019 | 3/3 | SYR4 |
| TTHM | 37 µg/L 46% of the EPA limit 80 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019
Highest in the ZIP: 83.15 µg/L — Ak-Chin Village · 11,646 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.105 µg/L 15% of the EPA limit 60 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019
Highest in the ZIP: 26 µg/L — Ak-Chin Village · 11,646 people · 2019 | 3/3 | SYR4 |
| Selenium | 3.82 µg/L 7.6% of the EPA limit 50 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 22.3 µg/L — Ak-Chin Village · 11,646 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 21 µg/L 70% of the EPA limit 30 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019 | 3/3 | SYR4 |
| Lead | 2.395 µg/L 16% of the EPA limit 15 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 16.48 µg/L — COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 2/3 | SYR4 |
| Arsenic | 8.36 µg/L 84% of the EPA limit 10 µg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.8700 pCi/L 17% of the EPA limit 5 pCi/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2019
Highest in the ZIP: 5.42 pCi/L — Ak-Chin Village · 11,646 people · 2019 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.32 pCi/L 22% of the EPA limit 15 pCi/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2018
Highest in the ZIP: 3.42 pCi/L — Ak-Chin Village · 11,646 people · 2019 | 2/3 | SYR4 |
| Bromoform | 2.39 µg/L No EPA limit set Highest in the ZIP: COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 1.095 µg/L No EPA limit set Highest in the ZIP: COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 1.095 µg/L No EPA limit set Highest in the ZIP: COPPER MOUNTAIN RANCH CFD · 1,071 people · 2019 | 1/3 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L Highest in the ZIP: Ak-Chin Village · 11,646 people · 2019 | 1/3 | SYR4 |
| Pfhxa | 0.0030 µg/L No EPA limit set Highest in the ZIP: Ak-Chin Village · 11,646 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GW SANTA CRUZ WATER CO · 84,000 people · 2024
Highest in the ZIP: 0.0010 mg/L — Ak-Chin Village · 11,646 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.
Water suppliers serving ZIP 85138
| Supplier | State | Population served |
|---|---|---|
| GW SANTA CRUZ WATER CO | AZ | 84,000 |
| Ak-Chin Village | AZ | 11,646 |
| COPPER MOUNTAIN RANCH CFD | AZ | 1,071 |
Frequently asked questions about ZIP 85138 tap water
Is the tap water in ZIP 85138 safe to drink?
EPA testing detected 22 contaminants across the water suppliers serving ZIP 85138. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 85138?
3 public water suppliers report EPA drinking-water monitoring for ZIP 85138. Each is listed above with its population served.
What contaminants are in ZIP 85138's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Lithium, Chromium, and others across this ZIP's suppliers. The full list with levels and sources is above.