Nitrate in Casa Grande, AZ Drinking Water
Nitrate data for Casa Grande, Arizona · 140,682 residents · 8 ZIP codes
Not every city shows Nitrate in its water data; in Casa Grande, Arizona, federal sampling has confirmed its presence at detectable levels in at least one recent reporting cycle.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Nitrate in Casa Grande Tap Water
Nitrate has been detected in Casa Grande, Arizona drinking water at a maximum level of 9.16 ppb — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 140,682 residents across 8 ZIP codes in Casa Grande.
Casa Grande's overall water quality grade is B (82/100).
Is Nitrate in Casa Grande Water Safe?
Nitrate was detected in Casa Grande water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis or ion exchange filter can reduce nitrate levels further.
Nitrate Levels by ZIP Code
| ZIP Code | Nitrate Level | EPA Limit | Status |
|---|---|---|---|
| 85122 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85130 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85193 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85194 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85222 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85230 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85293 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
| 85294 | 9.16 ppm | 10 mg/L (as nitrogen) | OK |
Average nitrate level across Casa Grande: 9.16 ppb
Health Effects of Nitrate
- Methemoglobinemia ("blue baby syndrome") in infants under 6 months
- Increased risk of colorectal and bladder cancer (long-term)
- Thyroid disease from chronic exposure
- Possible reproductive effects
Health risk severity: High. Governed by the National Primary Drinking Water Regulations.
How Nitrate Gets Into Drinking Water
- Agricultural fertilizer runoff
- Animal feedlot operations and manure
- Septic system leachate
- Urban stormwater and wastewater discharge
What to Do About Nitrate in Casa Grande Water
- Reverse osmosis is the most effective method for nitrate removal
- Ion exchange systems designed for nitrate can also work
- Standard carbon filters do NOT remove nitrate
- Boiling water increases nitrate concentration — never boil for nitrate
Look for filters certified under NSF 53 / NSF 58 for nitrate removal.