Public water system · MO1010320
ActiveGrain Valley Pws
At a glance
Grain Valley Pws (PWSID MO1010320) is an active community water system in Jackson County, Missouri. It reports serving 16,000 people through 6,052 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 1 is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
16,000
Service connections
6,052
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Grain Valley Pws compare with other water systems in Jackson County?
By EPA's size categories, Grain Valley Pws is a large system (10,001 to 100,000 people). Jackson County has 29 active public water systems. Its population served is about 12% above the county average of 14,288 people per system, and accounts for 3.9% of the 414,341 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active community water system reports serving 6,703 people, so Grain Valley Pws is about 139% above 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. Missouri has 1,612 active community water systems, 55% of the state's 2,943 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 177 Missouri systems (6%) list purchased groundwater as their primary source.
Who owns and regulates Grain Valley Pws?
EPA lists Grain Valley Pws as owned by a local government. The MO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 17 of the 29 active systems in Jackson County (59%) are also owned by a local government.
Does Grain Valley Pws have drinking water violations?
EPA's records list 11 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between September 1992 and July 2025. By type: 8 monitoring and reporting, 1 reporting, 1 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (9 of them). EPA lists 10 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2015-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1996-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1992-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 11 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.
Grain Valley Pws: frequently asked questions
Who runs Grain Valley Pws?
Grain Valley Pws (PWSID MO1010320) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Grain Valley Pws serve?
Grain Valley Pws reports serving 16,000 people through 6,052 service connections in Jackson County, Missouri.
Where does Grain Valley Pws get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Grain Valley Pws have any drinking water violations?
EPA's records list 11 violations for this system; 1 is health-based, and the most recent began in July 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 Grain Valley Pws' 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 11 violations for this system; 1 is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Grain Valley Pws' water quality report?
As a community water system, Grain Valley Pws 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 Jackson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Independence Pws | Jackson | 120,000 | Community | Groundwater |
| Lees Summit Pws | Jackson | 99,400 | Community | Purchased surface water |
| Blue Springs Pws | Jackson | 61,084 | Community | Purchased surface water |
| Jackson County Pwsd 1 | Jackson | 24,500 | Community | Purchased groundwater |
| Raytown Water Company | Jackson | 17,066 | Community | Purchased surface water |
| Jackson County Pwsd 2 | Jackson | 16,440 | 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, “Grain Valley Pws, PWSID MO1010320, Missouri”, https://aquacensus.com/water-systems/missouri/grain-valley-pws-mo1010320 (data as of October 1, 2026).