What was found in Sierra Vista'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 3300 µg/L 33% of the EPA limit 10000 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 4500 µg/L — BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 12/12 | SYR4 |
| Nitrate-Nitrite | 2630 µg/L 26% of the EPA limit 10000 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 2916 µg/L — EAST SLOPE WATER - WEST · 655 people · 2019 | 12/12 | SYR4 |
| Fluoride | 912.5 µg/L 23% of the EPA limit 4000 µg/L Highest in the city: NORTHERN SUNRISE WC MUSTANG CRYSTAL · 315 people · 2019 | 11/12 | SYR4 |
| Barium | 322.5 µg/L 16% of the EPA limit 2000 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 426 µg/L — CLOUD NINE WATER COMPANY · 143 people · 2017 | 12/12 | SYR4 |
| Copper | 159 µg/L 12% of the EPA limit 1300 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2017
Highest in the city: 250 µg/L — SOUTHLAND UTILITIES - GOLDEN ACRES · 1,614 people · 2019 | 12/12 | SYR4 |
| TTHM | 9.25 µg/L 12% of the EPA limit 80 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 47.45 µg/L — BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 9/12 | SYR4 |
| Combined Uranium | 3.8276 µg/L 13% of the EPA limit 30 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 24 µg/L — BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 3/12 | SYR4 |
| Xylenes, Total | 17.25 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the city: BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 4/12 | SYR4 |
| Lithium | 10.6 µg/L No EPA limit set Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2024
Highest in the city: 14.2 µg/L — ARIZONA WATER CO - SIERRA VISTA · 9,175 people · 2024 | 2/12 | UCMR-5 |
| Lead | 2.38 µg/L 16% of the EPA limit 15 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2017
Highest in the city: 12.1 µg/L — SOUTHLAND UTILITIES - GOLDEN ACRES · 1,614 people · 2019 | 12/12 | SYR4 |
| Total Haloacetic Acids (HAA5) | 6.74 µg/L 11% of the EPA limit 60 µg/L Highest in the city: ARIZONA WATER CO - SIERRA VISTA · 9,175 people · 2019 | 4/12 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2 pCi/L 13% of the EPA limit 15 pCi/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 6 pCi/L — BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 3/12 | SYR4 |
| Chromium | 4.52 µg/L 4.5% of the EPA limit 100 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019 | 3/12 | SYR4 |
| Arsenic | 0.9370 µg/L 9.4% of the EPA limit 10 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 4.235 µg/L — NORTHERN SUNRISE WC MUSTANG CRYSTAL · 315 people · 2019 | 6/12 | SYR4 |
| Combined Radium (-226 And -228) | 0.7000 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 2.305 pCi/L — ARIZONA WATER CO - SIERRA VISTA · 9,175 people · 2018 | 4/12 | SYR4 |
| Toluene | 1 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019
Highest in the city: 1.7 µg/L — SOUTHLAND UTILITIES - GOLDEN ACRES · 1,614 people · 2018 | 2/12 | SYR4 |
| Ethylbenzene | 1.3595 µg/L 0.2% of the EPA limit 700 µg/L Highest in the city: BELLA VISTA WATER SOUTH · 2,178 people · 2019 | 1/12 | SYR4 |
| Bromoform | 1 µg/L No EPA limit set Highest in the city: EAST SLOPE WATER - WEST · 655 people · 2019 | 1/12 | SYR4 |
| Dibromochloromethane | 0.8000 µg/L No EPA limit set Highest in the city: EAST SLOPE WATER - WEST · 655 people · 2019 | 1/12 | SYR4 |
| Bromodichloromethane | 0.6000 µg/L No EPA limit set Highest in the city: EAST SLOPE WATER - WEST · 655 people · 2019 | 1/12 | SYR4 |
| Mercury | 0.5200 µg/L 26% of the EPA limit 2 µg/L Highest in the city: EAST SLOPE WATER - WEST · 655 people · 2014 | 1/12 | SYR4 |
| Cadmium | 0.4100 µg/L 8.2% of the EPA limit 5 µg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2019 | 1/12 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2023
Highest in the city: 0.0069 mg/L — EAST SLOPE WATER - WEST · 655 people · 2025 | 12/12 | LCR |
| Pfhxa | 0.0044 µg/L No EPA limit set Highest in the city: ARIZONA WATER CO - SIERRA VISTA · 9,175 people · 2024 | 1/12 | UCMR-5 |
| Pfpea | 0.0035 µg/L No EPA limit set Main supplier: BELLA VISTA CITY WATER SYSTEM · 20,045 people · 2024 | 2/12 | 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 Sierra Vista
| Supplier | Population served |
|---|---|
| BELLA VISTA CITY WATER SYSTEM | 20,045 |
| PUEBLO DEL SOL WATER COMPANY | 12,804 |
| ARIZONA WATER CO - SIERRA VISTA | 9,175 |
| BELLA VISTA WATER SOUTH | 2,178 |
| EAST SLOPE WATER COMPANY | 1,980 |
| SOUTHLAND UTILITIES - GOLDEN ACRES | 1,614 |
| SOUTHERN SUNRISE WC COCHISE HORSESHOE | 1,588 |
| EAST SLOPE WATER - WEST | 655 |
| SIERRA VISTA MH VILLAGE | 328 |
| NORTHERN SUNRISE WC MUSTANG CRYSTAL | 315 |
| CLOUD NINE WATER COMPANY | 143 |
| SULGER WATER COMPANY 2 | 67 |
Frequently asked questions about Sierra Vista tap water
Is Sierra Vista tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Sierra Vista. 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 Sierra Vista?
12 public water suppliers report drinking-water monitoring for Sierra Vista, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Sierra Vista's water?
The contaminants EPA monitoring detected in Sierra Vista include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. 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.