Public water system · TX1050111
ActiveMountain Crest Water
At a glance
Mountain Crest Water (PWSID TX1050111) is an active community water system in Hays County, Texas. It reports serving 309 people through 103 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
309
Service connections
103
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mountain Crest Water compare with other water systems in Hays County?
By EPA's size categories, Mountain Crest Water is a very small system (500 people or fewer). Hays County has 118 active public water systems. Its population served is well below the county average of 2,597 people per system, and accounts for 0.1% of the 306,428 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active community water system reports serving 6,703 people, so Mountain Crest Water is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Texas has 4,594 active community water systems, 65% 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 Mountain Crest Water?
EPA lists Mountain Crest Water as privately owned. 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. 87 of the 118 active systems in Hays County (74%) are also privately owned.
Does Mountain Crest Water have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2023. The violations listed here began between February 2005 and January 2023. By type: 3 monitoring and reporting. The contaminants or rules involved are Total trihalomethanes (TTHM), Haloacetic acids (HAA5) and Total coliform bacteria (TCR). EPA lists 2 as archived and 1 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. 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 |
|---|---|---|---|---|
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Archived |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2005-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 3 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.
Mountain Crest Water: frequently asked questions
Who runs Mountain Crest Water?
Mountain Crest Water (PWSID TX1050111) is a community water system privately owned. It is regulated by the TX state drinking water program.
How many people does Mountain Crest Water serve?
Mountain Crest Water reports serving 309 people through 103 service connections in Hays County, Texas.
Where does Mountain Crest Water 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 Mountain Crest Water have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2023. 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 Mountain Crest Water'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. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.
Where can I find Mountain Crest Water's water quality report?
As a community water system, Mountain Crest Water must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Hays County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of San Marcos | Hays | 72,970 | Community | Surface water |
| City of Kyle | Hays | 52,000 | Community | Purchased surface water |
| Texas State University - San Marcos | Hays | 43,552 | Community | Groundwater |
| Goforth Sud | Hays | 34,893 | Community | Purchased surface water |
| County Line Sud | Hays | 19,609 | Community | Purchased surface water |
| City of Buda | Hays | 13,830 | Community | Purchased surface water |
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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, “Mountain Crest Water, PWSID TX1050111, Texas”, https://aquacensus.com/water-systems/texas/mountain-crest-water-tx1050111 (data as of October 1, 2026).