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SOUTHWESTERN RESEARCH STATION

PWS ID: AZ0402357 · PORTAL, Arizona 85632

SOUTHWESTERN RESEARCH STATION serves 40 people in PORTAL, Arizona using Groundwater water sources. It has 246 recorded EPA violations, including 9 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SOUTHWESTERN RESEARCH STATION

SOUTHWESTERN RESEARCH STATION is a local-owned non-transient non-community water system that delivers drinking water to 40 residents in PORTAL, Arizona (Cochise County) through 14 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 246 total violations for this system , of which 9 (4%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 212 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 Interim Enhanced Surface Water Treatment Rule, recorded in 41 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. SOUTHWESTERN RESEARCH STATION's 246 violations sit above 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
40
Total Violations
246
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
14
County
Cochise
School/Daycare
No
MCL Violations
0
Monitoring Violations
212
Treatment Tech Violations
9

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Interim Enhanced Surface Water Treatment Rule MR 41 2018
Surface Water Treatment Rule MR 26 2018
Chlorine MR 21 2009
Lead and Copper Rule MR 14 2020
TTHM MR 9 2017
Total Haloacetic Acids (HAA5) MR 9 2017
Coliform (TCR) MR 7 2007
Revised Total Coliform Rule RPT 7 2024
Revised Total Coliform Rule TT 6 2025
E. COLI MR 3 2024
Lead and Copper Rule TT 3 2019
Nitrate MR 2 2000
trans-1,2-Dichloroethylene MR 2 1998
1,2-Dichloroethane MR 2 1998
1,1,1-Trichloroethane MR 2 1998
1,2-Dichloropropane MR 2 1998
CHLOROBENZENE MR 2 1998
Toluene MR 2 1998
Styrene MR 2 1998
Xylenes, Total MR 2 2002
DICHLOROMETHANE MR 2 1998
Revised Total Coliform Rule MON 2 2018
p-Dichlorobenzene MR 2 1998
1,1-Dichloroethylene MR 2 1998
Benzene MR 2 1998
Carbon tetrachloride MR 2 1998
1,1,2-Trichloroethane MR 2 1998
o-Dichlorobenzene MR 2 1998
Tetrachloroethylene MR 2 1998
cis-1,2-Dichloroethylene 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 SOUTHWESTERN RESEARCH STATION.

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 AZ0402357 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 SOUTHWESTERN RESEARCH STATION 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 Revised Total Coliform Rule TT 6 SDWIS / AZ0402357 / 8000
2025 Public Notice Other 1 SDWIS / AZ0402357 / 7500
2024 Revised Total Coliform Rule RPT 7 SDWIS / AZ0402357 / 8000
2024 E. COLI MR 3 SDWIS / AZ0402357 / 3014
2020 Lead and Copper Rule MR 14 SDWIS / AZ0402357 / 5000
2019 Lead and Copper Rule TT 3 SDWIS / AZ0402357 / 5000
2018 Interim Enhanced Surface Water Treatment Rule MR 41 SDWIS / AZ0402357 / 0300
2018 Surface Water Treatment Rule MR 26 SDWIS / AZ0402357 / 0200
2018 Revised Total Coliform Rule MON 2 SDWIS / AZ0402357 / 8000
2017 TTHM MR 9 SDWIS / AZ0402357 / 2950
2017 Total Haloacetic Acids (HAA5) MR 9 SDWIS / AZ0402357 / 2456
2009 Chlorine MR 21 SDWIS / AZ0402357 / 0999
2007 Coliform (TCR) MR 7 SDWIS / AZ0402357 / 3100
2002 Xylenes, Total MR 2 SDWIS / AZ0402357 / 2955
2002 1,2,4-Trichlorobenzene MR 2 SDWIS / AZ0402357 / 2378

How SOUTHWESTERN RESEARCH STATION Compares

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

Metric SOUTHWESTERN RESEARCH STATION Arizona avg Federal benchmark
Total violations 246 153.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 9 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 40 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 SOUTHWESTERN RESEARCH STATION water safe to drink? ▼
SOUTHWESTERN RESEARCH STATION (PWS ID: AZ0402357) has 246 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 40 people using Groundwater sources.
How many people does SOUTHWESTERN RESEARCH STATION serve? ▼
SOUTHWESTERN RESEARCH STATION serves 40 people in PORTAL, Arizona. It is a Local-owned system using Groundwater water sources with 14 service connections.
What type of violations does SOUTHWESTERN RESEARCH STATION have? ▼
SOUTHWESTERN RESEARCH STATION has 246 total violations: 9 health-based violations (MCL exceedances or treatment failures), 212 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SOUTHWESTERN RESEARCH STATION water? ▼
No PFAS testing data is available for SOUTHWESTERN RESEARCH STATION under the EPA's UCMR5 monitoring program.
What water source does SOUTHWESTERN RESEARCH STATION use? ▼
SOUTHWESTERN RESEARCH STATION 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.

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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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