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Non-Transient Non-Community Water System · PWS AZ0402102

Coronado Elementary

Hereford, Arizona 85615 - drinking water served from groundwater sources to 446 people, tracked in EPA SDWIS and UCMR5.

446
People served
99
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 99 drinking-water violations at Coronado Elementary, 1% of them health-based - below the Arizona per-system average.

99
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
446
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coronado Elementary

Coronado Elementary is a local-owned non-transient non-community water system that delivers drinking water to 446 residents in Hereford, Arizona (Cochise County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 99 total violations for this system , of which 1 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 92 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 12 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%).

Coronado Elementary's 99 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
446
Total Violations
99
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
2
County
Cochise
School/Daycare
Yes
MCL Violations
1
Monitoring Violations
92
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 12 2015
1,2,4-Trichlorobenzene MR 2 2002
cis-1,2-Dichloroethylene MR 2 2002
o-Dichlorobenzene MR 2 2002
1,1-Dichloroethylene MR 2 2002
Carbon tetrachloride MR 2 2002
1,1,2-Trichloroethane MR 2 2002
Toluene MR 2 2002
Xylenes, Total MR 2 2002
DICHLOROMETHANE MR 2 2002
1,2-Dichloroethane MR 2 2002
1,1,1-Trichloroethane MR 2 2002
Benzene MR 2 2002
Ethylbenzene MR 2 2002
Styrene MR 2 2002
Total Haloacetic Acids (HAA5) MR 2 2019
TTHM MR 2 2019
trans-1,2-Dichloroethylene MR 2 2002
Chromium MR 1 1998
CYANIDE MR 1 1998
Mercury MR 1 1998
Selenium MR 1 1998
Antimony, Total MR 1 1998
Thallium, Total MR 1 1998
p-Dichlorobenzene MR 1 1998
1,2-Dichloropropane MR 1 1998
Trichloroethylene MR 1 1998
BHC-GAMMA MR 1 1998
Methoxychlor MR 1 1998
Toxaphene 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 Coronado Elementary.

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 AZ0402102 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 Coronado Elementary 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
2019 Total Haloacetic Acids (HAA5) MR 2 SDWIS / AZ0402102 / 2456
2019 TTHM MR 2 SDWIS / AZ0402102 / 2950
2015 Coliform (TCR) MR 12 SDWIS / AZ0402102 / 3100
2004 Coliform (TCR) MCL 1 SDWIS / AZ0402102 / 3100
2002 1,2,4-Trichlorobenzene MR 2 SDWIS / AZ0402102 / 2378
2002 cis-1,2-Dichloroethylene MR 2 SDWIS / AZ0402102 / 2380
2002 o-Dichlorobenzene MR 2 SDWIS / AZ0402102 / 2968
2002 1,1-Dichloroethylene MR 2 SDWIS / AZ0402102 / 2977
2002 Carbon tetrachloride MR 2 SDWIS / AZ0402102 / 2982
2002 1,1,2-Trichloroethane MR 2 SDWIS / AZ0402102 / 2985
2002 Toluene MR 2 SDWIS / AZ0402102 / 2991
2002 Xylenes, Total MR 2 SDWIS / AZ0402102 / 2955
2002 DICHLOROMETHANE MR 2 SDWIS / AZ0402102 / 2964
2002 1,2-Dichloroethane MR 2 SDWIS / AZ0402102 / 2980
2002 1,1,1-Trichloroethane MR 2 SDWIS / AZ0402102 / 2981

How Coronado Elementary Compares

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

Metric Coronado Elementary Arizona avg Federal benchmark
Total violations 99 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 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 446 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 Coronado Elementary water safe to drink? ▼
Coronado Elementary (PWS ID: AZ0402102) has 99 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 446 people using Groundwater sources.
How many people does Coronado Elementary serve? ▼
Coronado Elementary serves 446 people in Hereford, Arizona. It is a Local-owned system using Groundwater water sources with 2 service connections.
What type of violations does Coronado Elementary have? ▼
Coronado Elementary has 99 total violations: 1 health-based violations (MCL exceedances or treatment failures), 92 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coronado Elementary water? ▼
No PFAS testing data is available for Coronado Elementary under the EPA's UCMR5 monitoring program.
What water source does Coronado Elementary use? ▼
Coronado Elementary uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.