Public water system · TX1012882
ActiveWest Harris County MUD 21
At a glance
West Harris County MUD 21 (PWSID TX1012882) is an active non-transient non-community water system in Harris County, Texas. It reports serving 300 people through 20 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in December 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
300
Service connections
20
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does West Harris County MUD 21 compare with other water systems in Harris County?
By EPA's size categories, West Harris County MUD 21 is a very small system (500 people or fewer). Harris County has 1,246 active public water systems. Its population served is well below the county average of 4,849 people per system, and accounts for less than 0.1% of the 6,041,784 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 West Harris County MUD 21 is about 30% 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. 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 West Harris County MUD 21?
EPA lists West Harris County MUD 21 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. 508 of the 1,246 active systems in Harris County (41%) are also owned by a local government.
Does West Harris County MUD 21 have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in December 2013. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2013-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
West Harris County MUD 21: frequently asked questions
Who runs West Harris County MUD 21?
West Harris County MUD 21 (PWSID TX1012882) 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 West Harris County MUD 21 serve?
West Harris County MUD 21 reports serving 300 people through 20 service connections in Harris County, Texas.
Where does West Harris County MUD 21 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 West Harris County MUD 21 have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in December 2013. 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 West Harris County MUD 21'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 one violation for this system; it is not health-based, and the most recent began in December 2013. For current results, consult EPA ECHO, or the TX state drinking water program.
Where can I find West Harris County MUD 21's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. West Harris County MUD 21 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 Harris County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Houston | Harris | 2,970,543 | Community | Surface water |
| City of Pasadena | Harris | 152,000 | Community | Purchased surface water |
| Clear Lake City Water Authority | Harris | 89,702 | Community | Purchased surface water |
| City of Baytown | Harris | 86,004 | Community | Purchased surface water |
| City of Houston Ud 5 - Kingwood | Harris | 80,073 | Community | Groundwater |
| Harris County MUD 165 | Harris | 40,503 | 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, “West Harris County MUD 21, PWSID TX1012882, Texas”, https://aquacensus.com/water-systems/texas/west-harris-county-mud-21-tx1012882 (data as of October 1, 2026).