Public water system · MT0000156
ActiveLockwood Water and Sewer District
At a glance
Lockwood Water and Sewer District (PWSID MT0000156) is an active community water system in Yellowstone County, Montana. It reports serving 5,900 people through 2,049 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2013.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,900
Service connections
2,049
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Lockwood Water and Sewer District compare with other water systems in Yellowstone County?
By EPA's size categories, Lockwood Water and Sewer District is a medium system (3,301 to 10,000 people). Yellowstone County has 119 active public water systems, and Lockwood Water and Sewer District is the 4th-largest of them by population served. Its population served is about 4.1 times the county average of 1,422 people per system, and accounts for 3.5% of the 169,240 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active community water system reports serving 6,703 people, so Lockwood Water and Sewer District is about 12% 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. Montana has 853 active community water systems, 36% of the state's 2,378 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 60 Montana systems (2.5%) list surface water as their primary source.
Who owns and regulates Lockwood Water and Sewer District?
EPA lists Lockwood Water and Sewer District as owned by a local government. The MT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 15 of the 119 active systems in Yellowstone County (13%) are also owned by a local government.
Does Lockwood Water and Sewer District have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2013. The violations listed here began between July 2004 and July 2013. By type: 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Consumer Confidence Rule, Asbestos, Haloacetic acids (HAA5) and Total trihalomethanes (TTHM). EPA lists 3 as resolved and 1 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2013-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Asbestoscode 1094 | No | Archived |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
All 4 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.
Lockwood Water and Sewer District: frequently asked questions
Who runs Lockwood Water and Sewer District?
Lockwood Water and Sewer District (PWSID MT0000156) is a community water system owned by a local government. It is regulated by the MT state drinking water program.
How many people does Lockwood Water and Sewer District serve?
Lockwood Water and Sewer District reports serving 5,900 people through 2,049 service connections in Yellowstone County, Montana.
Where does Lockwood Water and Sewer District get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Lockwood Water and Sewer District have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 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 Lockwood Water and Sewer District'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 4 violations for this system; none is health-based, and the most recent began in July 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Lockwood Water and Sewer District's water quality report?
As a community water system, Lockwood Water and Sewer District 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 Yellowstone County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Billings City of | Yellowstone | 114,000 | Community | Surface water |
| Billings Heights Co Water Dist of | Yellowstone | 12,000 | Community | Purchased surface water |
| Laurel Municipal Water System | Yellowstone | 6,339 | Community | Surface water |
| Rocky Mountain College | Yellowstone | 5,700 | Non-transient non-community | Purchased surface water |
| Montana State University Billings | Yellowstone | 2,999 | Non-transient non-community | Purchased surface water |
| Pioneer Water Service | Yellowstone | 900 | 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, “Lockwood Water and Sewer District, PWSID MT0000156, Montana”, https://aquacensus.com/water-systems/montana/lockwood-water-and-sewer-district-mt0000156 (data as of October 1, 2026).