Public water system · AZ0402357

Active

Southwestern Research Station

At a glance

Southwestern Research Station (PWSID AZ0402357) is an active non-transient non-community water system in Cochise County, Arizona. It reports serving 40 people through 14 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDAZ0402357

System typeNon-transient non-community water system

Activity statusActive

Population served40

Service connections14

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyAZ state drinking water program

City servedPortal

StateArizona

ZIP—

CountyCochise County

How does Southwestern Research Station compare with other water systems in Cochise County?

By EPA's size categories, Southwestern Research Station is a very small system (500 people or fewer). Cochise County has 104 active public water systems. Its population served is well below the county average of 1,253 people per system, and accounts for less than 0.1% of the 130,277 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Southwestern Research Station is well below that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Arizona has 232 active non-transient non-community water systems, 13% of the state's 1,769 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,612 Arizona systems (91%) list groundwater as their primary source.

Who owns and regulates Southwestern Research Station?

EPA lists Southwestern Research Station as owned by a local government. The AZ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 18 of the 104 active systems in Cochise County (17%) are also owned by a local government.

Does Southwestern Research Station have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2025. The violations listed here began between April 2019 and September 2025. By type: 5 required treatment not met, 3 monitoring and reporting, 3 reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (7 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2025-09-12	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2025-06-24	Required treatment not metTreatment Technique, Level 2 Assessment (RTCR) · code 2B	Revised Total Coliform Rulecode 8000	Yes	Resolved
2025-05-26	Required treatment not metTreatment Technique, Level 2 Assessment (RTCR) · code 2B	Revised Total Coliform Rulecode 8000	Yes	Resolved
2024-08-09	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2024-08-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2024-04-01	ReportingReport Startup Procedures Cert Form (RTCR) · code 4C	Revised Total Coliform Rulecode 8000	No	Resolved
2024-04-01	Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D	Revised Total Coliform Rulecode 8000	Yes	Resolved
2022-04-01	Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D	Revised Total Coliform Rulecode 8000	Yes	Resolved
2022-04-01	ReportingReport Startup Procedures Cert Form (RTCR) · code 4C	Revised Total Coliform Rulecode 8000	No	Resolved
2020-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2020-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2019-04-01	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved

The 12 most recent violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Southwestern Research Station: frequently asked questions

Who runs Southwestern Research Station?

Southwestern Research Station (PWSID AZ0402357) is a non-transient non-community water system owned by a local government. It is regulated by the AZ state drinking water program.

How many people does Southwestern Research Station serve?

Southwestern Research Station reports serving 40 people through 14 service connections in Cochise County, Arizona.

Where does Southwestern Research Station get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Southwestern Research Station have any drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Southwestern Research Station's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2025. For current results, consult EPA ECHO, or the AZ state drinking water program.

Where can I find Southwestern Research Station's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Southwestern Research Station is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Cochise County

Water system	County	Population served	Type	Source
Bella Vista City Water System	Cochise	20,045	Community	Groundwater
Douglas City of	Cochise	16,656	Community	Groundwater
Us Army Fort Huachuca	Cochise	15,603	Community	Groundwater
Pueblo Del Sol Water Company	Cochise	12,804	Community	Groundwater
Arizona Water Co - Sierra Vista	Cochise	9,175	Community	Groundwater
Arizona Water Co - Bisbee	Cochise	8,707	Community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Southwestern Research Station, PWSID AZ0402357, Arizona”, https://aquacensus.com/water-systems/arizona/southwestern-research-station-az0402357 (data as of October 1, 2026).