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THIM UTILITY COMPANY - RANCHO VISTA

PWS ID: AZ0410351 · TUCSON, Arizona 85754

THIM UTILITY COMPANY - RANCHO VISTA serves 105 people in TUCSON, Arizona using Groundwater water sources. It has 129 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: THIM UTILITY COMPANY - RANCHO VISTA

THIM UTILITY COMPANY - RANCHO VISTA is a private-owned community water system that delivers drinking water to 105 residents in TUCSON, Arizona (Pima County) through 43 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 129 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 118 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 10 violations (Other). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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. THIM UTILITY COMPANY - RANCHO VISTA's 129 violations sit below the Arizona average. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
105
Total Violations
129
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
43
County
Pima
School/Daycare
No
MCL Violations
0
Monitoring Violations
118
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 10 2019
Coliform (TCR) MR 9 2013
Nitrate MR 8 2005
Lead and Copper Rule MR 3 2024
ETHYLENE DIBROMIDE MR 2 1998
Chlordane MR 2 1998
Chlorine MR 2 2019
Xylenes, Total MR 2 1998
DICHLOROMETHANE MR 2 1998
1,1-Dichloroethylene MR 2 1998
trans-1,2-Dichloroethylene MR 2 1998
1,2-Dichloroethane MR 2 1998
Carbon tetrachloride MR 2 1998
1,2-Dichloropropane MR 2 1998
Benzene MR 2 1998
Styrene MR 2 1998
1,2,4-Trichlorobenzene MR 2 1998
p-Dichlorobenzene MR 2 1998
CHLOROBENZENE MR 2 1998
1,1,2-Trichloroethane MR 2 1998
Tetrachloroethylene MR 2 1998
Ethylbenzene MR 2 1998
BHC-GAMMA MR 2 1998
Methoxychlor MR 2 1998
Toxaphene MR 2 1998
Dalapon MR 2 1998
Diquat MR 2 1998
Endothall MR 2 1998
Di(2-ethylhexyl) adipate MR 2 1998
OXAMYL MR 2 1998

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 THIM UTILITY COMPANY - RANCHO VISTA.

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 AZ0410351 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 THIM UTILITY COMPANY - RANCHO VISTA 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
2024 Lead and Copper Rule MR 3 SDWIS / AZ0410351 / 5000
2019 Consumer Confidence Rule Other 10 SDWIS / AZ0410351 / 7000
2019 Chlorine MR 2 SDWIS / AZ0410351 / 0999
2013 Coliform (TCR) MR 9 SDWIS / AZ0410351 / 3100
2005 Nitrate MR 8 SDWIS / AZ0410351 / 1040
1998 ETHYLENE DIBROMIDE MR 2 SDWIS / AZ0410351 / 2946
1998 Chlordane MR 2 SDWIS / AZ0410351 / 2959
1998 Xylenes, Total MR 2 SDWIS / AZ0410351 / 2955
1998 DICHLOROMETHANE MR 2 SDWIS / AZ0410351 / 2964
1998 1,1-Dichloroethylene MR 2 SDWIS / AZ0410351 / 2977
1998 trans-1,2-Dichloroethylene MR 2 SDWIS / AZ0410351 / 2979
1998 1,2-Dichloroethane MR 2 SDWIS / AZ0410351 / 2980
1998 Carbon tetrachloride MR 2 SDWIS / AZ0410351 / 2982
1998 1,2-Dichloropropane MR 2 SDWIS / AZ0410351 / 2983
1998 Benzene MR 2 SDWIS / AZ0410351 / 2990

How THIM UTILITY COMPANY - RANCHO VISTA Compares

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

Metric THIM UTILITY COMPANY - RANCHO VISTA Arizona avg Federal benchmark
Total violations 129 153.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 105 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is THIM UTILITY COMPANY - RANCHO VISTA water safe to drink? ▼
THIM UTILITY COMPANY - RANCHO VISTA (PWS ID: AZ0410351) has 129 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 105 people using Groundwater sources.
How many people does THIM UTILITY COMPANY - RANCHO VISTA serve? ▼
THIM UTILITY COMPANY - RANCHO VISTA serves 105 people in TUCSON, Arizona. It is a Private-owned system using Groundwater water sources with 43 service connections.
What type of violations does THIM UTILITY COMPANY - RANCHO VISTA have? ▼
THIM UTILITY COMPANY - RANCHO VISTA has 129 total violations: 0 health-based violations (MCL exceedances or treatment failures), 118 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in THIM UTILITY COMPANY - RANCHO VISTA water? ▼
No PFAS testing data is available for THIM UTILITY COMPANY - RANCHO VISTA under the EPA's UCMR5 monitoring program.
What water source does THIM UTILITY COMPANY - RANCHO VISTA use? ▼
THIM UTILITY COMPANY - RANCHO VISTA 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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

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