Inorganic chemicals · 2025
Nitrate in Phoenix, AZ tap water
Phoenix, AZ's 2025 Nitrate measurement is below the federal limit of 10 mg/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Range Sample Results | 0–4.5 mg/L | 10 mg/L MCL |
Average Annual Average | 3.8 mg/L | 10 mg/L MCL |
Verbatim from Phoenix, AZ's 2025 Consumer Confidence Report — source document ↗
About Nitrate
A compound from fertilizer runoff, septic systems, and erosion of natural deposits.
Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
How Phoenix, AZ compares
5 of the 318 systems measuring Nitrate on The Water Map have it at or above the federal limit:
Nearby systems also reporting Nitrate:
People also ask
+Is there Nitrate in Phoenix, AZ tap water?
Yes — Phoenix, AZ's 2025 Consumer Confidence Report lists Nitrate at 3.8 mg/L. Phoenix, AZ's 2025 Nitrate measurement is below the federal limit of 10 mg/L (MCL).
+What's the federal limit for Nitrate in drinking water?
The federal MCL for Nitrate is 10 mg/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Nitrate?
A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
+Which other U.S. cities have Nitrate over the federal limit?
5 of the 318 systems on The Water Map measuring Nitrate report it at or above the federal limit. Examples include Columbus, OH, Hollywood, FL, Mcallen, TX.
+Where does this Nitrate measurement come from?
This page reproduces the Nitrate entry from the 2025 Consumer Confidence Report published by the Phoenix, AZ water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/az/phoenix/2025/source.