City of Tucson water quality
Tucson, AZ · serves 732,906 people (191,264 connections) · Groundwater · Local government · EPA ID AZ0410112
Data: U.S. EPA · How we read the data · How we check it
Buys water from Marana Municipal – Picture Rocks. Treated water bought from another system can carry that system's contaminants.
Summary
No federal limits exceeded in EPA data.
- PFAS
- Detected, below limit1 of 29 PFAS found at least once. All averages below the federal limits.
- Lithium
- Above screening levelHighest result 63.7 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level0.65 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2023. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read City of Tucson's water quality report (Consumer Confidence Report, from the utility). It lists every regulated contaminant tested, including ones not on this page. Questions: (520) 837-2430.
PFAS (“forever chemicals”)
EPA UCMR 5: 83 entry points tested Jan 2024 to Nov 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Detected, below limit Guideline 6,000 ppt | 4.05 ppt |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 1 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 112 of 162 samples. Highest result 63.7 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 0.65 ppb lead (Jan 2021 – Dec 2023). Below action level
Highest since 2016: 1.1 ppb (Dec 2017).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2021 – Dec 2023 | 0.65 ppb |
| Jan 2018 – Dec 2020 | 0.9 ppb |
| Jan 2015 – Dec 2017 | 1.1 ppb |
Earlier results (7)
| Jan 2012 – Dec 2014 | 1 ppb |
| Jan 2009 – Dec 2011 | 2.2 ppb |
| Jan 2007 – Dec 2009 | 2 ppb |
| Jan 2005 – Dec 2007 | 3 ppb |
| Jan 2002 – Dec 2002 | 3 ppb |
| Jul 1992 – Dec 1992 | 5 ppb |
| Jan 1992 – Jun 1992 | 7 ppb |
Lead service lines: City of Tucson publishes a service line inventory where you can look up what your line is made of. It doesn't publish summary counts.
Look up your address · Source (the utility, collected by us on Nov 14, 2026, not EPA data) · Checking your own line
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 120 ppb | 300 ppb |
| Chromium-6 | 9.4 ppb | – |
| Vanadium | 11 ppb | 21 ppb |
| Chlorate | 1,100 ppb | 210 ppb |
| Molybdenum | 15 ppb | 40 ppb |
| Strontium | 1.7 ppm | 1.5 ppm |
| 1,4-Dioxane | 6.7 ppb | 0.35 ppb |
Where it serves
39 ZIP codes the system reported serving
85629, 85641, 85653, 85658, 85701, 85704, 85705, 85706, 85707, 85708, 85709, 85710, 85711, 85712, 85713, 85714, 85715, 85716, 85718, 85719, 85721, 85726, 85730, 85735, 85736, 85737, 85739, 85741, 85742, 85743, 85745, 85746, 85747, 85748, 85749, 85750, 85755, 85756, 85757
Nearby utilities
- Flowing Wells Irrigation District Tucson · same area · PFAS above limit
- Global Water – Farmers Water Company – Santa Rita Springs Sahuarita · 16 mi · PFAS above limit
- Marana Municipal – Hartman Vistas Marana · 27 mi · PFAS above limit
- Marana Municipal – Marana Marana · 27 mi · PFAS above limit
- Liberty Water Rio Rico Rio Rico · 46 mi · PFAS above limit
- US Army Fort Huachuca Water System Sierra Vista · 52 mi · PFAS above limit
Questions
Is City of Tucson water safe to drink?
City of Tucson has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does City of Tucson water have PFAS?
Yes. EPA's 2023–2025 testing of City of Tucson found 1 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in City of Tucson water?
The most recent 90th-percentile lead result for City of Tucson is 0.65 ppb, for the period ending Dec 2023. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for AZ0410112: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID AZ0410112).
- EPA SDWIS download: the lead results, population and violation records we use.
- City of Tucson's water quality report: the utility's own annual report, including contaminants EPA's national database doesn't carry (link checked Nov 14, 2026). Phone: (520) 837-2430.
- City of Tucson website
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.