Public water system · IA8429002
ActiveGranville Water Supply
At a glance
Granville Water Supply (PWSID IA8429002) is an active community water system in Sioux County, Iowa. It reports serving 310 people through 186 service connections. Its primary water source is purchased groundwater under influence, 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 July 1999.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
310
Service connections
186
Primary source
GUP
Purchased groundwater under influence
System type
CWS
Community water system
System record
How does Granville Water Supply compare with other water systems in Sioux County?
By EPA's size categories, Granville Water Supply is a very small system (500 people or fewer). Sioux County has 16 active public water systems. Its population served is well below the county average of 2,416 people per system, and accounts for 0.8% of the 38,650 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Granville Water Supply 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. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Purchased groundwater under the influence of surface water means the system buys that kind of water from another public water system. 20 Iowa systems (1.1%) list purchased groundwater under influence as their primary source.
Who owns and regulates Granville Water Supply?
EPA lists Granville Water Supply as owned by a local government. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 13 of the 16 active systems in Sioux County (81%) are also owned by a local government.
Does Granville Water Supply have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 1999. The violations listed here began between July 1990 and July 1999. By type: 6 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 1999-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 1993-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1990-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Resolved |
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.
Granville Water Supply: frequently asked questions
Who runs Granville Water Supply?
Granville Water Supply (PWSID IA8429002) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Granville Water Supply serve?
Granville Water Supply reports serving 310 people through 186 service connections in Sioux County, Iowa.
Where does Granville Water Supply get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater under influence. Purchased groundwater under the influence of surface water means the system buys that kind of water from another public water system.
Does Granville Water Supply have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 1999. 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 Granville Water Supply'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 July 1999. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Granville Water Supply's water quality report?
As a community water system, Granville Water Supply 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 Sioux County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sioux Center Municipal Water Department | Sioux | 8,231 | Community | Groundwater |
| Orange City Municipal Water Department | Sioux | 6,267 | Community | Groundwater |
| Southern Sioux County Rural Water | Sioux | 5,420 | Community | Groundwater |
| Rock Valley Water Supply | Sioux | 4,059 | Community | Groundwater |
| Rural Water System #1 | Sioux | 3,428 | Community | Groundwater under influence of surface water |
| Hawarden Water Supply | Sioux | 2,700 | Community | Groundwater |
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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, “Granville Water Supply, PWSID IA8429002, Iowa”, https://aquacensus.com/water-systems/iowa/granville-water-supply-ia8429002 (data as of October 1, 2026).