Phoenix’s drinking water comes from City of Phoenix (EPA system AZ0407025), which draws surface water from a river, lake or reservoir and treats it before distribution for about 1,695,000 people. EPA’s records associate 4 sizeable community systems with Phoenix; City of Phoenix is the main one, and it is the system this page examines in depth. This page translates that system’s official EPA record — lead and copper results, violation history, and what the data does and does not say — into plain English.
This page is built entirely from the U.S. EPA’s Safe Drinking Water Information System (SDWIS), the same records state regulators use. We did not test Phoenix’s water, and system-level data describes the utility’s water as a whole — not what comes out of one specific home’s tap. Where the record is silent, we say so rather than guess.
Key takeaways
- City of Phoenix supplies Phoenix (Surface water); it serves about 1,695,000 people across its service area.
- City of Phoenix’s most recent reported 90th-percentile lead result is 2.74 ppb, below the EPA action level of 15 ppb.
- 1 health-based violation in the last 10 years — details below, with dates and current status.
- EPA does not track hardness. If you’re shopping for a softener, test first and size from a real grains-per-gallon number.
The water system serving Phoenix
City of Phoenix is the community water system the EPA associates with Phoenix, Arizona. It reports a population served of about 1,695,000.
| System | EPA ID | People served | Source water | Role |
|---|---|---|---|---|
| City of Phoenix | AZ0407025 | 1,695,000 | Surface water | Main system |
| Epcor – North East Agua Fria | AZ0407531 | 14,723 | Groundwater | Also serves the area |
| Rose Valley Water Company | AZ0407065 | 6,202 | Groundwater | Also serves the area |
| Federal Correction Institution | AZ0407700 | 1,500 | Groundwater | Also serves the area |
EPA’s records associate 5 further systems with the Phoenix area beyond the ones above — neighbourhood districts, subdivisions and mobile-home parks among them. If your water bill names a different system, that name — not the city name — is the record to check.
Not sure which system serves your address? Run your ZIP code through our What’s In My Water? lookup — it resolves the systems EPA lists for your ZIP and shows the same records in full.
Lead and copper
Lead: City of Phoenix’s most recent reported 90th-percentile lead result is 2.74 ppb, below the EPA action level of 15 ppb.
Read those numbers carefully: a 90th percentile is a system-wide statistic from a sample of homes, not a test of your tap. Lead in drinking water comes mostly from a home’s own plumbing — service lines, solder and fixtures — so two houses on the same street can test very differently. Homes built before 1986 carry the highest risk, whatever the system average says.
Violation history — the last 10 years
EPA records show 1 health-based violation for City of Phoenix in the last 10 years. Health-based means the serious kind — here is what it was:
- a regulated contaminant (EPA code 0300) — a required treatment technique step was not followed. Began January 2021; returned to compliance January 2021.
Separately, EPA lists 2 monitoring/reporting items for this system in the last 5 years — missed or late tests and paperwork. Those are compliance-process findings, not contamination findings, and we keep them in their own bucket on purpose.
What this means for your home
System data sets the background; your home’s plumbing writes the foreground. In practice:
- Lead is a plumbing question, not a system alarm, here. The system’s own result is low, so the remaining risk sits in your home’s pipes and fixtures. A filter certified to NSF/ANSI 53 for lead is cheap insurance for older homes; our water filter guides explain the certifications without the marketing.
- Taste and smell: surface-water systems disinfect with chlorine or chloramine, which is most of what people taste. A basic carbon filter (NSF/ANSI 42) handles it; our chloramine vs chlorine explainer helps you tell which one your water has.
- Hardness is not in this record — by design. The EPA doesn’t track it, so nobody can honestly tell you your grains-per-gallon from this page. Scale on fixtures and shower doors is a hint, not a measurement. Test (strips are a start; a lab test is better — see how to test your water at home), then size any softener with our softener sizing calculator and the softener hub.
- On a private well instead of city water? None of this system’s record applies to your tap — start with our well water hub for the test-first approach.
Water quality in nearby cities
New York, NY · Los Angeles, CA · Houston, TX
This guide is one of our per-city water reports — see the full list on the Water Quality hub, alongside our contaminant explainers and testing guides.
Frequently asked questions
Is Phoenix water safe to drink?
The honest answer is: largely yes today, with real entries on its record. City of Phoenix has 1 health-based violation in the last 10 years (detailed in the violation section above); all of them now show as returned to compliance. A returned-to-compliance violation is history, not a current failure — and for lead, {lead_clause}. EPA data describes the system as a whole, not your tap; lead usually comes from a home’s own plumbing, so a certified home test is the only way to know your exact water.
Where does Phoenix get its drinking water?
City of Phoenix is the community water system the EPA associates with Phoenix. It draws surface water from a river, lake or reservoir and treats it before distribution and serves about 1,695,000 people across its service area (EPA system ID AZ0407025). 3 other sizeable systems also report serving parts of Phoenix — they are listed in the table above.
What is the lead level in Phoenix’s water?
City of Phoenix’s most recent reported 90th-percentile lead result is 2.74 ppb, below the EPA action level of 15 ppb. That figure is a system statistic from sampled homes, not a test of your tap — your own plumbing decides your exposure, and a certified home test is the only way to know it.
Has Phoenix’s water system had violations?
Yes — 1 health-based violation in the last 10 years, listed with dates and status in the violation section above. All of them show as returned to compliance in EPA’s record.
Do I need a water filter in Phoenix?
Base it on the record above, not on fear. The violations on this system’s history point at the contaminants worth filtering for; for everyday taste, a carbon filter does the job. Whatever you consider, match its NSF/ANSI certification to the specific job — and test your hardness before anyone sells you a softener.
Source: U.S. EPA SDWIS via Envirofacts, retrieved November 12, 2026. System-level data describes the utility’s water, not any individual tap. If your water bill names a different system, that system’s record is the one that applies to you.