What was found in Casa Grande's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 92000 µg/L 7077% of the EPA limit, in the worst sample — 1300 µg/L | 7/8 | SYR4 |
| Nitrate | 12000 µg/L 120% of the EPA limit, in the worst sample — 10000 µg/L | 6/8 | SYR4 |
| Nitrate-Nitrite | 11200 µg/L 112% of the EPA limit, in the worst sample — 10000 µg/L | 6/8 | SYR4 |
| Fluoride | 3080 µg/L 77% of the EPA limit 4000 µg/L | 5/8 | SYR4 |
| Lithium | 353 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Lead | 225 µg/L 1500% of the EPA limit, in the worst sample — 15 µg/L | 7/8 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L | 5/8 | SYR4 |
| TTHM | 91 µg/L 114% of the EPA limit, in the worst sample — 80 µg/L | 7/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 74 µg/L 123% of the EPA limit, in the worst sample — 60 µg/L | 6/8 | SYR4 |
| Chromium | 36 µg/L 36% of the EPA limit 100 µg/L | 3/8 | SYR4 |
| Dibromochloromethane | 22.2 µg/L No EPA limit set | 2/8 | SYR4 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L | 2/8 | SYR4 |
| Arsenic | 11 µg/L 110% of the EPA limit, in the worst sample — 10 µg/L | 5/8 | SYR4 |
| Bromoform | 9.1 µg/L No EPA limit set | 1/8 | SYR4 |
| Bromodichloromethane | 6.5 µg/L No EPA limit set | 2/8 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set | 1/8 | SYR4 |
| Combined Radium (-226 And -228) | 2.5 pCi/L 50% of the EPA limit 5 pCi/L | 2/8 | SYR4 |
| Chloroform | 1.4 µg/L No EPA limit set | 1/8 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1 µg/L 18% of the EPA limit 6 µg/L | 3/8 | SYR4 |
| Xylenes, Total | 1.1 µg/L 0% of the EPA limit 10000 µg/L | 1/8 | SYR4 |
| PFBS | 0.0911 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfpea | 0.0208 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfba | 0.0199 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfhxa | 0.0186 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfhpa | 0.0094 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L | 8/8 | LCR |
| PFHXS | 0.0061 µg/L No EPA limit set | 1/8 | UCMR-5 |
Water suppliers serving Casa Grande
| Supplier | Population served |
|---|---|
| ARIZONA WATER CO - PINAL VALLEY | 134,432 |
| PICACHO WATER COMPANY | 2,440 |
| ARIZONA WATER CO - TIERRA GRANDE | 1,796 |
| AWC - CASA GRANDE WEST WATER COMPANY | 943 |
| ARIZONA WATER CO - STANFIELD | 639 |
| SIERRA VISTA RV PARK | 200 |
| AWC - CASA GRANDE SOUTH WATER COMPANY | 176 |
| GW SANTA CRUZ WATER - CP WATER CO | 37 |
Frequently asked questions about Casa Grande tap water
Is Casa Grande tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Casa Grande. 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 Casa Grande?
8 public water suppliers report drinking-water monitoring for Casa Grande, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Casa Grande's water?
The contaminants EPA monitoring detected in Casa Grande include Copper, Nitrate, Nitrate-Nitrite, Fluoride, Lithium. The full list, with the highest level found 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.