Nitrate · Arizona

Nitrate in Arizona Drinking Water — 79 ZIPs Tested

EPA data analysis for nitrate in Arizona drinking water systems

ZipCheckup tracks Nitrate in Arizona drinking water: 79 ZIP codes with detected levels on record. 1 ZIP code exceeds the EPA limit (10 mg/L (as nitrogen)). Nitrate carries a high health-risk designation.

79
ZIPs with Detections
1
ZIPs with Violations
0.2%
Violation Rate
10 mg/L (as nitrogen)
EPA Limit
High
Health Risk
Reverse Osmosis or Ion Exchange
Best Filter Method

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 9160 ppb 10000 ppb Within Limit
2 85123 Arizona City 9160 ppb 10000 ppb Within Limit
3 85128 Coolidge 9160 ppb 10000 ppb Within Limit
4 85130 Casa Grande 9160 ppb 10000 ppb Within Limit
5 85172 Stanfield 9160 ppb 10000 ppb Within Limit
6 85193 Casa Grande 9160 ppb 10000 ppb Within Limit
7 85194 Casa Grande 9160 ppb 10000 ppb Within Limit
8 85222 Casa Grande 9160 ppb 10000 ppb Within Limit
9 85230 Casa Grande 9160 ppb 10000 ppb Within Limit
10 85293 Casa Grande 9160 ppb 10000 ppb Within Limit
11 85294 Casa Grande 9160 ppb 10000 ppb Within Limit
12 85634 Sells 7200 ppb 10000 ppb Within Limit
13 85639 Topawa 7200 ppb 10000 ppb Within Limit
14 85701 Tucson 7200 ppb 10000 ppb Within Limit
15 85702 Tucson 7200 ppb 10000 ppb Within Limit
16 85703 Tucson 7200 ppb 10000 ppb Within Limit
17 85704 Tucson 7200 ppb 10000 ppb Within Limit
18 85705 Tucson 7200 ppb 10000 ppb Within Limit
19 85706 Tucson 7200 ppb 10000 ppb Within Limit
20 85709 Tucson 7200 ppb 10000 ppb Within Limit

Lowest Nitrate Levels in Arizona

ZIP Code City Level Detected
86555 Douglas 5600 ppb
85655 Douglas 5600 ppb
85626 Pirtleville 5600 ppb
85608 Douglas 5600 ppb
85607 Douglas 5600 ppb
85286 Chandler 6200 ppb
85249 Chandler 6200 ppb
85248 Chandler 6200 ppb
85246 Chandler 6200 ppb
85244 Chandler 6200 ppb

Cities with Nitrate Data in Arizona

15 cities in Arizona have nitrate testing data available.

Arizona Water Quality Overview: See statewide water quality rankings on the Arizona water quality page.
Learn more about Nitrate: Read the full guide on Nitrate in drinking water.
Home → Contaminants → Nitrate → Arizona

How to cite this page

APA ZipCheckup. (2026). Nitrate in Arizona Drinking Water — 79 ZIPs Tested. https://zipcheckup.com/contaminants/nitrates/arizona/
BibTeX 
@misc{zipcheckup-contaminants-nitrates-arizona,
  author = {{ZipCheckup}},
  title  = {{Nitrate in Arizona Drinking Water — 79 ZIPs Tested}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/nitrates/arizona/}
}

Data as of July 2026.

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