Public water system · TX0150190

Active

Southwest Isd Main

At a glance

Southwest Isd Main (PWSID TX0150190) is an active non-transient non-community water system in Bexar County, Texas. It reports serving 5,364 people through 17 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, 2 are health-based, and the most recent began in December 2025.

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

Population served

5,364

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDTX0150190

System typeNon-transient non-community water system

Activity statusActive

Population served5,364

Service connections17

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyBexar County

How does Southwest Isd Main compare with other water systems in Bexar County?

By EPA's size categories, Southwest Isd Main is a medium system (3,301 to 10,000 people). Bexar County has 77 active public water systems. Its population served is well below the county average of 37,744 people per system, and accounts for 0.2% of the 2,906,298 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Southwest Isd Main is about 12 times 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. Texas has 862 active non-transient non-community water systems, 12% of the state's 7,078 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 5,215 Texas systems (74%) list groundwater as their primary source.

Who owns and regulates Southwest Isd Main?

EPA lists Southwest Isd Main as owned by a local government. The TX state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 77 active systems in Bexar County (26%) are also owned by a local government.

Does Southwest Isd Main have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in December 2025. The violations listed here began between October 2019 and December 2025. By type: 5 monitoring and reporting, 5 public notice, recordkeeping or other and 2 required treatment not met. The contaminant or rule involved most often is Lead and Copper 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
2025-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2021-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2021-06-20	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-10-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-09-29	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2020-06-21	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-06-21	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-04-01	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved
2020-03-31	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved
2020-03-23	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2019-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2019-10-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	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.

Southwest Isd Main: frequently asked questions

Who runs Southwest Isd Main?

Southwest Isd Main (PWSID TX0150190) is a non-transient non-community water system owned by a local government. It is regulated by the TX state drinking water program.

How many people does Southwest Isd Main serve?

Southwest Isd Main reports serving 5,364 people through 17 service connections in Bexar County, Texas.

Where does Southwest Isd Main 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 Southwest Isd Main have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in December 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 Southwest Isd Main'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, 2 are health-based, and the most recent began in December 2025. For current results, consult EPA ECHO, or the TX state drinking water program.

Where can I find Southwest Isd Main's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Southwest Isd Main 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 Bexar County

Water system	County	Population served	Type	Source
San Antonio Water System	Bexar	2,643,729	Community	Purchased surface water
Jbsa Sam Houston	Bexar	37,563	Community	Groundwater
City of Converse	Bexar	29,709	Community	Purchased surface water
East Central Sud	Bexar	26,137	Community	Purchased surface water
Jbsa Lackland	Bexar	20,907	Community	Groundwater
City of Universal City	Bexar	20,119	Community	Groundwater

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Southwest Isd Main, PWSID TX0150190, Texas”, https://aquacensus.com/water-systems/texas/southwest-isd-main-tx0150190 (data as of October 1, 2026).