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GW OCOTILLO WATER - SIERRITA FOOTHILLS

PWS ID: AZ0410270 · MARICOPA, Arizona 85138

GW OCOTILLO WATER - SIERRITA FOOTHILLS serves 84 people in MARICOPA, Arizona using Groundwater water sources. It has 98 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: GW OCOTILLO WATER - SIERRITA FOOTHILLS

GW OCOTILLO WATER - SIERRITA FOOTHILLS is a local-owned community water system that delivers drinking water to 84 residents in MARICOPA, Arizona (Pima County) through 29 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 98 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 88 monitoring and reporting violations are on file. The most recent violation on record dates to 2006.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 5 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. GW OCOTILLO WATER - SIERRITA FOOTHILLS's 98 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
84
Total Violations
98
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
29
County
Pima
School/Daycare
No
MCL Violations
0
Monitoring Violations
88
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 5 2006
Coliform (TCR) MR 3 1998
cis-1,2-Dichloroethylene MR 2 1998
DICHLOROMETHANE MR 2 1998
p-Dichlorobenzene MR 2 1998
1,1-Dichloroethylene MR 2 1998
trans-1,2-Dichloroethylene MR 2 1998
1,2-Dichloroethane MR 2 1998
1,1,1-Trichloroethane MR 2 1998
Carbon tetrachloride MR 2 1998
1,2-Dichloropropane MR 2 1998
Toluene MR 2 1998
Tetrachloroethylene MR 2 1998
Benzene MR 2 1998
Styrene MR 2 1998
Xylenes, Total MR 2 2002
o-Dichlorobenzene MR 2 1998
Trichloroethylene MR 2 1998
Ethylbenzene MR 2 1998
Nitrate MR 2 1999
CHLOROBENZENE MR 2 1998
1,1,2-Trichloroethane MR 2 1998
Beryllium, Total MR 1 1998
Selenium MR 1 1998
Endrin MR 1 1998
Methoxychlor MR 1 1998
Toxaphene MR 1 1998
Endothall MR 1 1998
Glyphosate MR 1 1998
OXAMYL MR 1 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 GW OCOTILLO WATER - SIERRITA FOOTHILLS.

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 AZ0410270 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 GW OCOTILLO WATER - SIERRITA FOOTHILLS 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
2006 Consumer Confidence Rule Other 5 SDWIS / AZ0410270 / 7000
2006 Lead and Copper Rule MR 1 SDWIS / AZ0410270 / 5000
2004 Chlorine MR 1 SDWIS / AZ0410270 / 0999
2002 Xylenes, Total MR 2 SDWIS / AZ0410270 / 2955
1999 Nitrate MR 2 SDWIS / AZ0410270 / 1040
1998 Coliform (TCR) MR 3 SDWIS / AZ0410270 / 3100
1998 cis-1,2-Dichloroethylene MR 2 SDWIS / AZ0410270 / 2380
1998 DICHLOROMETHANE MR 2 SDWIS / AZ0410270 / 2964
1998 p-Dichlorobenzene MR 2 SDWIS / AZ0410270 / 2969
1998 1,1-Dichloroethylene MR 2 SDWIS / AZ0410270 / 2977
1998 trans-1,2-Dichloroethylene MR 2 SDWIS / AZ0410270 / 2979
1998 1,2-Dichloroethane MR 2 SDWIS / AZ0410270 / 2980
1998 1,1,1-Trichloroethane MR 2 SDWIS / AZ0410270 / 2981
1998 Carbon tetrachloride MR 2 SDWIS / AZ0410270 / 2982
1998 1,2-Dichloropropane MR 2 SDWIS / AZ0410270 / 2983

How GW OCOTILLO WATER - SIERRITA FOOTHILLS Compares

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

Metric GW OCOTILLO WATER - SIERRITA FOOTHILLS Arizona avg Federal benchmark
Total violations 98 153.3 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 84 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 GW OCOTILLO WATER - SIERRITA FOOTHILLS water safe to drink? ▼
GW OCOTILLO WATER - SIERRITA FOOTHILLS (PWS ID: AZ0410270) has 98 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 84 people using Groundwater sources.
How many people does GW OCOTILLO WATER - SIERRITA FOOTHILLS serve? ▼
GW OCOTILLO WATER - SIERRITA FOOTHILLS serves 84 people in MARICOPA, Arizona. It is a Local-owned system using Groundwater water sources with 29 service connections.
What type of violations does GW OCOTILLO WATER - SIERRITA FOOTHILLS have? ▼
GW OCOTILLO WATER - SIERRITA FOOTHILLS has 98 total violations: 0 health-based violations (MCL exceedances or treatment failures), 88 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GW OCOTILLO WATER - SIERRITA FOOTHILLS water? ▼
No PFAS testing data is available for GW OCOTILLO WATER - SIERRITA FOOTHILLS under the EPA's UCMR5 monitoring program.
What water source does GW OCOTILLO WATER - SIERRITA FOOTHILLS use? ▼
GW OCOTILLO WATER - SIERRITA FOOTHILLS 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.

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