Public water system · ID2250023
ActiveGrangeville Water Dept
At a glance
Grangeville Water Dept (PWSID ID2250023) is an active community water system in Idaho County, Idaho. It reports serving 3,151 people through 1,502 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,151
Service connections
1,502
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Grangeville Water Dept compare with other water systems in Idaho County?
By EPA's size categories, Grangeville Water Dept is a small system (501 to 3,300 people). Idaho County has 54 active public water systems, and Grangeville Water Dept is the largest of them by population served. Its population served is about 17 times the county average of 185 people per system, and accounts for 32% of the 9,970 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active community water system reports serving 6,703 people, so Grangeville Water Dept is about half of 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. Idaho has 765 active community water systems, 39% of the state's 1,961 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,861 Idaho systems (95%) list groundwater as their primary source.
Who owns and regulates Grangeville Water Dept?
EPA lists Grangeville Water Dept as owned by a local government. The ID state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 9 of the 54 active systems in Idaho County (17%) are also owned by a local government.
Does Grangeville Water Dept have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025. The violations listed here began between January 2020 and January 2025. By type: 12 monitoring and reporting. The contaminants or rules involved are Haloacetic acids (HAA5), Nitrate, Total trihalomethanes (TTHM) and 1,2-Dichloropropane. EPA lists 10 as archived and 2 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloropropanecode 2983 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlorobenzenecode 2989 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Archived |
The 12 most recent 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.
Grangeville Water Dept: frequently asked questions
Who runs Grangeville Water Dept?
Grangeville Water Dept (PWSID ID2250023) is a community water system owned by a local government. It is regulated by the ID state drinking water program.
How many people does Grangeville Water Dept serve?
Grangeville Water Dept reports serving 3,151 people through 1,502 service connections in Idaho County, Idaho.
Where does Grangeville Water Dept 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 Grangeville Water Dept have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 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 Grangeville Water Dept'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the ID state drinking water program.
Where can I find Grangeville Water Dept's water quality report?
As a community water system, Grangeville Water Dept 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 Idaho County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cottonwood Water Dept | Idaho | 977 | Community | Groundwater |
| Kooskia Water Dept | Idaho | 607 | Community | Groundwater |
| Riggins City of | Idaho | 434 | Community | Groundwater |
| Idoc North Idaho Correctional Institute | Idaho | 425 | Community | Groundwater |
| Pine Ridge Water and Sewer Dist | Idaho | 390 | Community | Purchased surface water |
| Elk City Water and Sewer Assn | Idaho | 320 | Community | 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, “Grangeville Water Dept, PWSID ID2250023, Idaho”, https://aquacensus.com/water-systems/idaho/grangeville-water-dept-id2250023 (data as of October 1, 2026).