Nitrate in Arizona Drinking Water — 79 ZIPs Tested
EPA data analysis for nitrate in Arizona drinking water systems
Nitrate Contamination in Arizona
ZipCheckup analyzed drinking water data across 553 ZIP codes in Arizona for nitrate contamination. 79 ZIP codes have reported nitrate detections, and 1 have EPA violations on record.
The violation rate for nitrate in Arizona is 0.2% of all ZIP codes — lower than the national average.
EPA Standard for Nitrate
The EPA maximum contaminant level (MCL) for nitrate is 10 mg/L (as nitrogen), governed by the National Primary Drinking Water Regulations. Water systems that exceed this limit must take corrective action and notify consumers.
Worst ZIP Codes for Nitrate in Arizona
These ZIP codes reported the highest nitrate levels in Arizona based on CCR reports and EPA data:
Lowest Nitrate Levels in Arizona
These ZIP codes had the lowest reported nitrate detections in Arizona:
Health Effects of Nitrate
How to Remove Nitrate From Drinking Water
The most effective treatment for nitrate removal is Reverse Osmosis or Ion Exchange. Look for filters certified under NSF 53 / NSF 58 standards.
Check Your ZIP Code
Use the ZipCheckup water quality search to see nitrate data for your specific water system in Arizona.
Worst ZIP Codes for Nitrate in Arizona
Ranked by highest nitrate detection level.
| Rank | ZIP Code | City | Level Detected | EPA Limit | Status |
|---|---|---|---|---|---|
| 1 | 85122 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 2 | 85123 | Arizona City | 9.16 ppm | 10 ppm | Within Limit |
| 3 | 85128 | Coolidge | 9.16 ppm | 10 ppm | Within Limit |
| 4 | 85130 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 5 | 85172 | Stanfield | 9.16 ppm | 10 ppm | Within Limit |
| 6 | 85193 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 7 | 85194 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 8 | 85222 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 9 | 85230 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 10 | 85293 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 11 | 85294 | Casa Grande | 9.16 ppm | 10 ppm | Within Limit |
| 12 | 85634 | Sells | 7.2 ppm | 10 ppm | Within Limit |
| 13 | 85639 | Topawa | 7.2 ppm | 10 ppm | Within Limit |
| 14 | 85701 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 15 | 85702 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 16 | 85703 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 17 | 85704 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 18 | 85705 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 19 | 85706 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
| 20 | 85709 | Tucson | 7.2 ppm | 10 ppm | Within Limit |
Lowest Nitrate Levels in Arizona
Cities with Nitrate Data in Arizona
15 cities in Arizona have nitrate testing data available.