Tucson Water Quality at a Glance
legacy contamination
Is Tucson Water Safe to Drink?
Technically Compliant, But With Serious Legacy Concerns — Tucson Water meets all federal and state drinking water standards, but independent testing identifies 30 contaminants above EPA health guidelines. Key concerns include legacy TCE contamination from 1950s industrial dumping, PFAS “forever chemicals” from military bases and the airport area, arsenic exceeding health guidelines, chromium-6, and disinfection byproducts. Tucson Water serves over 730,000 customers and now delivers approximately 78% of its supply via Colorado River recharge-and-recovery, having shifted away from most groundwater sources due to contamination. Check our full national water quality database or explore filter recommendations for Tucson households.
⚠️ Key Concerns for Tucson Residents in 2026
- TCE Superfund Legacy: Decades of industrial dumping (1950s–1980s) created a Superfund site; cancer clusters documented in South Tucson; the TARP/AOP treatment plant processes up to 7 million gallons per day to remove TCE and related solvents
- PFAS “Forever Chemicals”: Contamination from Davis-Monthan Air Force Base and Tucson International Airport firefighting foam; Tucson Water voluntarily removes any well with detectable PFOA or PFOS — among the most proactive policies in the U.S.
- Arsenic Above Health Guidelines: Naturally occurring arsenic detected at levels exceeding EPA health-based targets; arsenic MCL is 10 ppb but health advocates recommend treatment well below that threshold
- Chromium-6 Detected: Carcinogenic hexavalent chromium found at levels significantly above health organisation guidelines; no federal MCL exists for chromium-6 specifically
- Lead Service Line Inventory Underway: Tucson Water completed its mandatory lead service line inventory by October 2024 under the updated Lead and Copper Rule Revisions
Read the full 2026 report below for detailed analysis, source data, and actionable recommendations for Tucson residents. Track local boil water notices or read the latest water quality news.
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Tucson, Arizona Water Quality Report 2026: PFAS Testing, Infrastructure Concerns & Safety Across Your City
Tucson Water provides comprehensive water services to over 730,000 customers across the greater Tucson metropolitan area, including the neighboring communities of Oro Valley, Marana, Sahuarita, and parts of unincorporated Pima County. As one of Arizona’s most proactive municipal utilities, the system delivers water through an extensive network of distribution lines, wells, and treatment facilities serving Arizona’s second-largest city and surrounding desert communities.
Tucson sources approximately 78% of its supply from recharged Colorado River water delivered through the Central Arizona Project (CAP) canal, stored underground via three aquifer recharge facilities, and recovered through wells. The remaining 22% comes from the Central Well Field — historically Tucson’s primary supply but now used primarily for peak demand and backup. After decades of contamination forced the closure and retirement of numerous groundwater wells, this innovative recharge-and-recovery model has allowed Tucson to dramatically reduce its reliance on a compromised aquifer. Per capita water consumption has fallen by around 37% since 1996, making the city a national leader in water conservation in the arid Southwest. For context on how Tucson compares statewide, see our Arizona water quality overview.
Tucson Water Quality: Current Status (2025–2026)
Latest Testing Results
- Lead and Copper Rule Revisions: Tucson Water completed its mandatory lead service line inventory by October 2024 as required under the updated Lead and Copper Rule Revisions. The utility maintains compliance with all lead and copper action levels. Residents with older plumbing are advised to flush taps before drinking and to use a certified filter as an added precaution.
- PFAS Monitoring: Tucson Water has been testing for PFAS since 2018, well ahead of the federal April 2027 monitoring deadline. The utility voluntarily removes any well showing detectable PFOA or PFOS — one of the most protective self-imposed policies of any U.S. utility. New EPA MCLs of 4 ppt for PFOA and PFOS became enforceable in April 2024, with a compliance deadline of April 2029. Follow the latest PFAS water news here.
- Compliance Status: Tucson’s water consistently meets all federal and state drinking water standards. The most recent EPA compliance assessment (April–June 2024) confirmed no health-based violations across all monitored parameters. However, independent data identifies 30 contaminants above non-enforceable health guidelines.
Water Sources
- Central Arizona Project (78%): Colorado River water delivered via the CAP canal to three recharge-and-recovery facilities — CAVSARP (2001), PMRRP (2001), and SAVSARP (2008) — stored underground and pumped back to customers through a network of recovery wells.
- Central Well Field (22%): The historic groundwater supply now functions primarily as a peak-demand resource and long-term strategic reserve. Many wells in the broader aquifer remain offline due to TCE and PFAS contamination from decades of industrial and military activity.
- One Water 2100 Master Plan: Tucson Water’s long-range planning framework treats surface water, groundwater, recycled water, and stormwater harvesting as equally important resources, with a sustainability horizon stretching to 2100.
Advanced Treatment Technology
- TARP/AOP Water Treatment Plant: The Tucson Area Remediation Project combined with an Advanced Oxidation Process facility treats contaminated groundwater, removing TCE, 1,4-dioxane, and PFAS. The facility can process up to 7 million gallons of purified water per day, with treated water discharged to the Santa Cruz River or the reclaimed water system.
- PFAS Removal Systems: A ADEQ-funded ion exchange demonstration system installed at a central supply well in December 2021 has proven effective at removing PFAS and limiting its migration toward the Central Well Field. A $25 million ADEQ grant (announced 2022) is funding further PFAS treatment improvements at TARP.
- Chlorine Disinfection: Approximately 1 part per million of chlorine is maintained throughout the distribution system, sampled at 248 locations monthly, ensuring consistent microbiological safety from source to tap. Disinfection byproducts (trihalomethanes, haloacetic acids) are monitored continuously.
Infrastructure Modernization
- Distribution System Expansion: Ongoing construction extending CAP delivery infrastructure to suburban communities including Oro Valley, Marana, and Sahuarita, reducing reliance on groundwater and improving system resilience as aquifer contamination issues persist.
- Smart Water Management: Advanced monitoring systems, automated meter infrastructure, and real-time quality sensors deployed throughout the distribution network enable rapid detection of quality events and system optimisation.
- Superfund Site Remediation: Ongoing remediation of the Tucson International Airport Area (TIAA) Superfund site on Tucson’s south-west side, coordinated between ADEQ, EPA, the City of Tucson, and responsible military parties. More than $130 million in legal settlements have funded cleanup and community health programmes since the 1980s.
Customer Protection Initiatives
Tucson Water maintains one of the most comprehensive water conservation programmes in the United States, helping customers reduce consumption through rebates, education, and tiered rate structures. The utility’s Contaminants of Emerging Concern (CEC) Sentry Programme monitors over 150 unregulated compounds annually — far exceeding federal requirements — and publishes detailed results each June. Per capita water use has fallen around 37% since 1996. The utility’s proactive approach to legacy TCE contamination and emerging PFAS concerns, backed by substantial federal and state funding, demonstrates its commitment to protecting public health while maintaining long-term water security in one of America’s most water-challenged regions. Residents can also track any active boil water notices affecting the Tucson area in real time.
Recommendations for Tucson Residents
Test Your Water
Contact Tucson Water at 520-791-5945 for water quality and pressure concerns, or visit tucsonaz.gov/Departments/Water/Water-Quality. Independent testing is especially recommended for homes near the south Tucson Superfund area, homes with older plumbing, or households concerned about PFAS exposure from the airport and military base plumes. Use our water quality checker to explore data for your area.
Maximize Conservation
Take advantage of Tucson Water’s extensive rebate programmes for high-efficiency appliances, native landscaping, and rainwater harvesting systems. Follow outdoor watering schedules and consider xeriscaping — Tucson’s per capita water use has fallen roughly 37% since 1996, and rebates continue to incentivise desert-adapted landscaping and efficient irrigation.
Consider Advanced Filtration
Given Tucson’s arsenic, chromium-6, PFAS, and disinfection byproduct concerns, an NSF-certified reverse osmosis system is the most effective at-home solution. RO removes PFAS, heavy metals, and nitrates in a single pass. See our full water filter guide for recommended systems suited to Tucson’s specific contaminant profile.
Participate in Rebate Programs
Apply for Tucson Water’s comprehensive rebate programmes covering high-efficiency toilets, washing machines, rainwater harvesting systems, and native plant landscaping. Visit tucsonaz.gov/Departments/Water for current offerings and application details. Rebates can significantly offset the cost of water-efficient upgrades for both homes and businesses.
Report Issues
Contact Tucson Water’s 24-hour emergency line at 520-791-4133 for water main breaks or urgent issues. For water quality and pressure concerns call 520-791-5945 (Mon–Fri, 8am–4:30pm) or email QualityAndPressure@tucsonaz.gov. Customer service and billing: 520-791-3242. Stay informed with our water alert news feed.
Frequently Asked Questions
Is Tucson’s tap water safe to drink in 2026?
Yes, Tucson’s tap water meets all federal and state drinking water standards as of the most recent EPA compliance assessment (April–June 2024). However, independent analysis identifies 30 contaminants above non-enforceable health guidelines, including arsenic, chromium-6, PFAS, and disinfection byproducts.
Tucson Water monitors approximately 90 regulated and 103 unregulated contaminants, and also runs an annual Contaminants of Emerging Concern (CEC) Sentry Programme assessing over 150 additional compounds. The utility proactively takes wells offline if PFOA or PFOS is detected at any level — significantly more protective than EPA requires. For households with older plumbing or located near the south Tucson Superfund area, independent testing and a certified point-of-use filter are advisable precautions. You can also check our national water quality database for Tucson-area data.
What is PFAS and how is Tucson addressing it in 2026?
PFAS (per- and polyfluoroalkyl substances) are synthetic “forever chemicals” that persist in the environment and the human body. In Tucson, contamination primarily originates from firefighting foam (AFFF) used at Davis-Monthan Air Force Base, the Arizona Air National Guard, and Tucson International Airport.
Since 2018, Tucson Water has proactively tested for PFAS and voluntarily removes any well showing detectable PFOA or PFOS — more protective than the new EPA MCL of 4 ppt. Key actions taken:
• Multiple contaminated wells removed from service; ADEQ-funded monitoring wells installed to track plume movement near the Central Well Field
• $25 million ADEQ grant (2022) funding enhanced PFAS treatment at the TARP facility
• Ion exchange treatment demonstration system operational at a supply well since December 2021
• TARP/AOP plant treats PFAS alongside TCE and 1,4-dioxane — up to 7 million gallons per day
EPA MCLs of 4 ppt for PFOA and PFOS became enforceable in April 2024. Utilities have until April 2029 to achieve full compliance. Read the latest PFAS updates in our news section.
How does Tucson’s water recharge system work?
Tucson employs a “recharge and recovery” system that now supplies approximately 78% of the city’s water. The process works as follows:
• Delivery: Colorado River water is transported 335 miles via the Central Arizona Project canal to Tucson
• Storage: Water is pumped into large infiltration basins at three facilities — CAVSARP, PMRRP, and SAVSARP — in the Avra Valley area, where it percolates into the underground aquifer
• Recovery: Stored water is later pumped from recovery wells, treated, and delivered through the distribution network
• Benefits: Natural soil filtration during recharge provides an additional treatment barrier; underground storage acts as a strategic reserve during Colorado River shortage periods
This system has allowed Tucson to maintain water security while reducing dependence on a historically contaminated aquifer. Per capita consumption has fallen around 37% since 1996. See our Arizona water overview for more context on state water management.
Are there water restrictions in Tucson in 2026?
Tucson operates under ongoing water conservation requirements tied to Colorado River shortage declarations and its own long-term sustainability commitments:
Outdoor Watering:
• Outdoor watering is limited to designated days based on property address
• No outdoor watering permitted between 10 a.m. and 6 p.m. during summer months
• Runoff and water waste are prohibited under city ordinance
Conservation Incentives:
• Rebate programmes for high-efficiency appliances, native plants, and rainwater harvesting
• Tiered rate structure rewards lower consumption
• Education programmes promoting desert-adapted, low-water-use lifestyles
Current restrictions and watering schedules are available at tucsonaz.gov/Departments/Water or by calling 520-791-3242. Monitor any emergency notices via our live boil water and water alert tracker.
Quality News About Your Water
Get the comprehensive water quality news coverage you need with our dedicated US Water News Service. From coast to coast, we deliver in-depth reporting and expert analysis on PFAS contamination, EPA regulatory changes, infrastructure developments, and emerging water safety issues affecting communities nationwide. While mainstream media only covers the biggest stories, we provide the detailed, ongoing coverage that helps you understand the full scope of America’s water challenges.
What’s actually in your tap water? Enter your ZIP code for a full breakdown of contaminants detected in your local supply
Drinking water from a well? Check our directory here for more information
Contaminants of Concern
PFAS Compounds
Source: Per- and polyfluoroalkyl substances originating from firefighting foam (AFFF) used at Davis-Monthan Air Force Base, the Arizona Air National Guard, and Tucson International Airport — contributing to the Tucson International Airport Area (TIAA) Superfund site on Tucson’s south-west side
Health Effects: Linked to immune system disruption, liver damage, altered cholesterol levels, and increased risk of certain cancers including kidney and testicular cancer; classified as probable human carcinogens by major health authorities
Current Status: Tucson Water removes wells voluntarily at any detectable level of PFOA or PFOS — stricter than the EPA’s 4 ppt MCL. A $25 million ADEQ-funded treatment upgrade is underway; the TARP/AOP plant processes PFAS-contaminated groundwater at up to 7 million gallons per day. EPA Limit: PFOA and PFOS MCL of 4 ppt (enforceable from April 2024; compliance deadline April 2029). PFNA, PFHxS, and GenX MCLs of 10 ppt each. Reverse osmosis systems are the most effective home treatment for PFAS.
Arsenic & Chromium-6
Arsenic Source: Naturally occurring mineral deposits in regional geology and desert aquifer formations — common across Arizona and the wider arid Southwest
Arsenic Health Effects: Potent carcinogen linked to bladder, lung, and skin cancer; also associated with cardiovascular disease and developmental effects in children; no safe threshold established for cancer risk
Arsenic Current Levels: Arsenic detected at levels above EWG health guidelines in Tucson water; maintained below the EPA MCL of 10 ppb but health advocates recommend treatment well below that limit. Independent testing found concentrations up to 7.6 ppb in recent reports. EPA Limit: 10 ppb MCL
Chromium-6 Source and Status: The carcinogenic “Erin Brockovich chemical” — hexavalent chromium — has been detected in Tucson’s water from both natural geological sources and industrial contamination. Levels significantly exceed EWG health guidelines. No federal MCL exists specifically for chromium-6; the only regulatory limit is for total chromium (100 ppb). See our filter guide — reverse osmosis effectively removes both arsenic and chromium-6.
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