PlainWater
States → Arizona

Community Water System · PWS AZ0410051

Flowing Wells Irrigation District

Tucson, Arizona 85705 - drinking water served from groundwater sources to 16,000 people, tracked in EPA SDWIS and UCMR5.

16,000
People served
936
EPA violations
5
Health-based
6 PFAS
UCMR5 result

The verdict

EPA records 936 drinking-water violations at Flowing Wells Irrigation District, 1% of them health-based - above the Arizona per-system average, and UCMR5 testing detected 6 PFAS compounds.

936
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
16,000
People served by this system
6
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Flowing Wells Irrigation District

Flowing Wells Irrigation District is a private-owned community water system that delivers drinking water to 16,000 residents in Tucson, Arizona (Pima County) through 3,662 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 936 total violations for this system , of which 5 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 893 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Chlorine, recorded in 24 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 6 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 9 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Arizona, EPA tracks 1,493 public water systems serving 7,322,166 people, with 228,944 cumulative violations and 15,663 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 153.3 violations. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Flowing Wells Irrigation District's 936 violations sit above the Arizona average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

6 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
16,000
Total Violations
936
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
3,662
County
Pima
School/Daycare
No
MCL Violations
1
Monitoring Violations
893
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 24 2021
TTHM MR 20 2024
Total Haloacetic Acids (HAA5) MR 20 2024
Di(2-ethylhexyl) phthalate MR 18 2004
Endothall MR 18 2004
trans-1,2-Dichloroethylene MR 17 2025
1,2-Dichloroethane MR 17 2025
1,1,1-Trichloroethane MR 17 2025
Carbon tetrachloride MR 17 2025
1,2-Dichloropropane MR 17 2025
Trichloroethylene MR 17 2025
Benzene MR 17 2025
Toluene MR 17 2025
Styrene MR 17 2025
1,2,4-Trichlorobenzene MR 17 2025
cis-1,2-Dichloroethylene MR 17 2025
DICHLOROMETHANE MR 17 2025
o-Dichlorobenzene MR 17 2025
p-Dichlorobenzene MR 17 2025
Tetrachloroethylene MR 17 2025
CHLOROBENZENE MR 17 2025
Xylenes, Total MR 17 2025
Ethylbenzene MR 17 2025
1,1-Dichloroethylene MR 17 2025
1,1,2-Trichloroethane MR 17 2025
Toxaphene MR 16 2004
Dalapon MR 16 2004
Glyphosate MR 16 2004
OXAMYL MR 16 2004
Picloram MR 16 2004

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 15 of 348 samples detected PFAS.

Contaminant Date Result MRL Status
PFUnA 8/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFMPA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 8/3/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 8/3/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFMBA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 8/3/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 8/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFDoA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/3/2023 5.00 ppt 3.00 ppt Detected
PFNA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 8/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFDA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 8/3/2023 3.00 ppt 3.00 ppt Detected
8:2 FTS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 8/3/2023 4.00 ppt 3.00 ppt Detected
ADONA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 8/3/2023 3.00 ppt 3.00 ppt Detected
PFTA 8/3/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 8/3/2023 <7.00 ppt 7.00 ppt Not Detected
HFPO-DA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/3/2023 <6.00 ppt 6.00 ppt Not Detected
9Cl-PF3ONS 8/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFHpA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/3/2023 8.00 ppt 3.00 ppt Detected
PFNA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 8/3/2023 4.00 ppt 4.00 ppt Detected
PFOA 8/3/2023 5.00 ppt 4.00 ppt Detected
PFDA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Flowing Wells Irrigation District.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AZ0410051 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arizona Drinking Water Authority

Arizona DEQ, Drinking Water Program is the primacy agency that licenses and inspects Flowing Wells Irrigation District under EPA-delegated authority.

Open AZ regulator portal

Source: Arizona DEQ, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 trans-1,2-Dichloroethylene MR 17 SDWIS / AZ0410051 / 2979
2025 1,2-Dichloroethane MR 17 SDWIS / AZ0410051 / 2980
2025 1,1,1-Trichloroethane MR 17 SDWIS / AZ0410051 / 2981
2025 Carbon tetrachloride MR 17 SDWIS / AZ0410051 / 2982
2025 1,2-Dichloropropane MR 17 SDWIS / AZ0410051 / 2983
2025 Trichloroethylene MR 17 SDWIS / AZ0410051 / 2984
2025 Benzene MR 17 SDWIS / AZ0410051 / 2990
2025 Toluene MR 17 SDWIS / AZ0410051 / 2991
2025 Styrene MR 17 SDWIS / AZ0410051 / 2996
2025 1,2,4-Trichlorobenzene MR 17 SDWIS / AZ0410051 / 2378
2025 cis-1,2-Dichloroethylene MR 17 SDWIS / AZ0410051 / 2380
2025 DICHLOROMETHANE MR 17 SDWIS / AZ0410051 / 2964
2025 o-Dichlorobenzene MR 17 SDWIS / AZ0410051 / 2968
2025 p-Dichlorobenzene MR 17 SDWIS / AZ0410051 / 2969
2025 Tetrachloroethylene MR 17 SDWIS / AZ0410051 / 2987

How Flowing Wells Irrigation District Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Flowing Wells Irrigation District Arizona avg Federal benchmark
Total violations 936 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection 6 compounds 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 16,000 4,904 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,493 regulated public water systems in Arizona.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Flowing Wells Irrigation District water safe to drink? ▼
Flowing Wells Irrigation District (PWS ID: AZ0410051) has 936 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 6 PFAS compounds found. This system serves 16,000 people using Groundwater sources.
How many people does Flowing Wells Irrigation District serve? ▼
Flowing Wells Irrigation District serves 16,000 people in Tucson, Arizona. It is a Private-owned system using Groundwater water sources with 3,662 service connections.
What type of violations does Flowing Wells Irrigation District have? ▼
Flowing Wells Irrigation District has 936 total violations: 5 health-based violations (MCL exceedances or treatment failures), 893 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Flowing Wells Irrigation District water? ▼
Yes. UCMR5 testing detected 6 PFAS compounds in Flowing Wells Irrigation District's water supply: PFHxS, PFHxA, PFBS, PFPeA, PFOS, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Flowing Wells Irrigation District use? ▼
Flowing Wells Irrigation District uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.