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Community Water System · PWS AZ0411076

Arizona Water Co - Tierra Grande

Phoenix, Arizona 85015-5351 - drinking water served from groundwater sources to 1,796 people, tracked in EPA SDWIS and UCMR5.

1,796
People served
23
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 23 drinking-water violations at Arizona Water Co - Tierra Grande, 17% of them health-based - below the Arizona per-system average.

23
Total EPA violations on record
17%
Health-based (MCL / treatment failure)
1,796
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Arizona Water Co - Tierra Grande

Arizona Water Co - Tierra Grande is a public/private-owned community water system that delivers drinking water to 1,796 residents in Phoenix, Arizona (Pinal County) through 374 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 23 total violations for this system , of which 4 (17%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 12 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 Coliform (TCR), recorded in 5 violations (MR). 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. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Arizona Water Co - Tierra Grande's 23 violations sit below 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.

Population Served
1,796
Total Violations
23
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Public/Private
Connections
374
County
Pinal
School/Daycare
No
MCL Violations
0
Monitoring Violations
12
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 5 2008
Chlorine MR 4 2015
LEAD AND COPPER RULE REVISIONS RPT 4 2024
LEAD AND COPPER RULE REVISIONS TT 4 2024
Lead and Copper Rule MR 2 2014
Revised Total Coliform Rule RPT 2 2020
Nitrate MR 1 2001
Consumer Confidence Rule Other 1 2002

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 Arizona Water Co - Tierra Grande.

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 AZ0411076 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 Arizona Water Co - Tierra Grande 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 REVISIONS RPT 4 SDWIS / AZ0411076 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 4 SDWIS / AZ0411076 / 5200
2020 Revised Total Coliform Rule RPT 2 SDWIS / AZ0411076 / 8000
2015 Chlorine MR 4 SDWIS / AZ0411076 / 0999
2014 Lead and Copper Rule MR 2 SDWIS / AZ0411076 / 5000
2008 Coliform (TCR) MR 5 SDWIS / AZ0411076 / 3100
2002 Consumer Confidence Rule Other 1 SDWIS / AZ0411076 / 7000
2001 Nitrate MR 1 SDWIS / AZ0411076 / 1040

How Arizona Water Co - Tierra Grande Compares

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

Metric Arizona Water Co - Tierra Grande Arizona avg Federal benchmark
Total violations 23 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 1,796 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 Arizona Water Co - Tierra Grande water safe to drink? ▼
Arizona Water Co - Tierra Grande (PWS ID: AZ0411076) has 23 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,796 people using Groundwater sources.
How many people does Arizona Water Co - Tierra Grande serve? ▼
Arizona Water Co - Tierra Grande serves 1,796 people in Phoenix, Arizona. It is a Public/Private-owned system using Groundwater water sources with 374 service connections.
What type of violations does Arizona Water Co - Tierra Grande have? ▼
Arizona Water Co - Tierra Grande has 23 total violations: 4 health-based violations (MCL exceedances or treatment failures), 12 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Arizona Water Co - Tierra Grande water? ▼
No PFAS testing data is available for Arizona Water Co - Tierra Grande under the EPA's UCMR5 monitoring program.
What water source does Arizona Water Co - Tierra Grande use? ▼
Arizona Water Co - Tierra Grande 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. 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.