Public water system · MN1500016
ActiveWaltham
At a glance
Waltham (PWSID MN1500016) is an active community water system in Mower County, Minnesota. It reports serving 157 people through 76 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
157
Service connections
76
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Waltham compare with other water systems in Mower County?
By EPA's size categories, Waltham is a very small system (500 people or fewer). Mower County has 54 active public water systems. Its population served is well below the county average of 679 people per system, and accounts for 0.4% of the 36,656 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active community water system reports serving 6,703 people, so Waltham 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. Minnesota has 987 active community water systems, 15% of the state's 6,465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.
Who owns and regulates Waltham?
EPA lists Waltham as owned by a local government. The MN 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 54 active systems in Mower County (28%) are also owned by a local government.
Does Waltham have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2023. The violations listed here began between April 1991 and October 2023. By type: 5 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 3 as resolved and 3 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 |
|---|---|---|---|---|
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Archived |
| 2021-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1992-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1991-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 6 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.
Waltham: frequently asked questions
Who runs Waltham?
Waltham (PWSID MN1500016) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Waltham serve?
Waltham reports serving 157 people through 76 service connections in Mower County, Minnesota.
Where does Waltham 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 Waltham have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 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 Waltham'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 6 violations for this system; none is health-based, and the most recent began in October 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Waltham's water quality report?
As a community water system, Waltham 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 Mower County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Austin Utilities | Mower | 26,174 | Community | Groundwater |
| Grand Meadow | Mower | 1,154 | Community | Groundwater |
| High Forest Rest Area Mndot | Mower | 1,001 | Transient non-community | Groundwater |
| Leroy | Mower | 959 | Community | Groundwater |
| Beaver Trails Jellystone | Mower | 750 | Transient non-community | Groundwater |
| Brownsdale | Mower | 682 | Community | Groundwater |
Related pages
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, “Waltham, PWSID MN1500016, Minnesota”, https://aquacensus.com/water-systems/minnesota/waltham-mn1500016 (data as of October 1, 2026).