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Community Water System · PWS AZ0401056

Aspc Apache

St. Johns, Arizona 85936 - drinking water served from groundwater sources to 540 people, tracked in EPA SDWIS and UCMR5.

540
People served
501
EPA violations
15
Health-based
Untested
UCMR5 result

The verdict

EPA records 501 drinking-water violations at Aspc Apache, 3% of them health-based - above the Arizona per-system average.

501
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
540
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Aspc Apache

Aspc Apache is a state-owned community water system that delivers drinking water to 540 residents in St. Johns, Arizona (Apache County) through 14 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 501 total violations for this system , of which 15 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 461 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 Nitrate, recorded in 20 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%).

Aspc Apache's 501 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.

Population Served
540
Total Violations
501
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Community
Owner Type
State
Connections
14
County
Apache
School/Daycare
No
MCL Violations
4
Monitoring Violations
461
Treatment Tech Violations
11

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 20 2019
Coliform (TCR) MR 13 2012
Lead and Copper Rule MR 11 2025
1,2,4-Trichlorobenzene MR 9 2018
1,2-Dichloropropane MR 8 2018
Trichloroethylene MR 8 2018
Consumer Confidence Rule Other 8 2011
1,1,2-Trichloroethane MR 8 2018
DICHLOROMETHANE MR 8 2018
p-Dichlorobenzene MR 8 2018
1,1-Dichloroethylene MR 8 2018
trans-1,2-Dichloroethylene MR 8 2018
1,1,1-Trichloroethane MR 8 2018
Carbon tetrachloride MR 8 2018
Toluene MR 8 2018
Ethylbenzene MR 8 2018
Styrene MR 8 2018
Tetrachloroethylene MR 8 2018
cis-1,2-Dichloroethylene MR 8 2018
o-Dichlorobenzene MR 8 2018
1,2-Dichloroethane MR 8 2018
CHLOROBENZENE MR 8 2018
Benzene MR 8 2018
Total Haloacetic Acids (HAA5) MR 8 2023
Xylenes, Total MR 8 2018
TTHM MR 8 2023
Arsenic MR 7 2015
Fluoride MR 7 2015
2,4-D MR 6 2018
Cadmium MR 6 2015

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 Aspc Apache.

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 AZ0401056 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 Aspc Apache 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 Lead and Copper Rule MR 11 SDWIS / AZ0401056 / 5000
2025 Revised Total Coliform Rule MON 3 SDWIS / AZ0401056 / 8000
2024 Groundwater Rule TT 4 SDWIS / AZ0401056 / 0700
2024 LEAD AND COPPER RULE REVISIONS TT 3 SDWIS / AZ0401056 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 3 SDWIS / AZ0401056 / 5200
2023 Total Haloacetic Acids (HAA5) MR 8 SDWIS / AZ0401056 / 2456
2023 TTHM MR 8 SDWIS / AZ0401056 / 2950
2021 Public Notice Other 4 SDWIS / AZ0401056 / 7500
2021 Revised Total Coliform Rule TT 4 SDWIS / AZ0401056 / 8000
2019 Nitrate MR 20 SDWIS / AZ0401056 / 1040
2018 1,2,4-Trichlorobenzene MR 9 SDWIS / AZ0401056 / 2378
2018 1,2-Dichloropropane MR 8 SDWIS / AZ0401056 / 2983
2018 Trichloroethylene MR 8 SDWIS / AZ0401056 / 2984
2018 1,1,2-Trichloroethane MR 8 SDWIS / AZ0401056 / 2985
2018 DICHLOROMETHANE MR 8 SDWIS / AZ0401056 / 2964

How Aspc Apache Compares

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

Metric Aspc Apache Arizona avg Federal benchmark
Total violations 501 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 15 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 540 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 Aspc Apache water safe to drink? ▼
Aspc Apache (PWS ID: AZ0401056) has 501 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 540 people using Groundwater sources.
How many people does Aspc Apache serve? ▼
Aspc Apache serves 540 people in St. Johns, Arizona. It is a State-owned system using Groundwater water sources with 14 service connections.
What type of violations does Aspc Apache have? ▼
Aspc Apache has 501 total violations: 15 health-based violations (MCL exceedances or treatment failures), 461 monitoring/reporting violations, and 11 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Aspc Apache water? ▼
No PFAS testing data is available for Aspc Apache under the EPA's UCMR5 monitoring program.
What water source does Aspc Apache use? ▼
Aspc Apache 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.