Public water system · IA9766041
ActivePierson Water Supply
At a glance
Pierson Water Supply (PWSID IA9766041) is an active community water system in Woodbury County, Iowa. It reports serving 345 people through 164 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, 8 are health-based, and the most recent began in October 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
345
Service connections
164
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Pierson Water Supply compare with other water systems in Woodbury County?
By EPA's size categories, Pierson Water Supply is a very small system (500 people or fewer). Woodbury County has 32 active public water systems. Its population served is well below the county average of 3,110 people per system, and accounts for 0.3% of the 99,514 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 Pierson 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.
Who owns and regulates Pierson Water Supply?
EPA lists Pierson 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. 20 of the 32 active systems in Woodbury County (63%) are also owned by a local government.
Does Pierson Water Supply have drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 2020. The violations listed here began between October 1986 and October 2020. By type: 8 contaminant level above the legal limit, 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Nitrate (9 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2020-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2004-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1994-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1994-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1994-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-08-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1993-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1992-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1987-01-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Nitratecode 1040 | No | Resolved |
| 1986-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
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.
Pierson Water Supply: frequently asked questions
Who runs Pierson Water Supply?
Pierson Water Supply (PWSID IA9766041) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Pierson Water Supply serve?
Pierson Water Supply reports serving 345 people through 164 service connections in Woodbury County, Iowa.
Where does Pierson Water Supply 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 Pierson Water Supply have any drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 2020. 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 Pierson 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. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Pierson Water Supply's water quality report?
As a community water system, Pierson 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 Woodbury County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sioux City Water Supply | Woodbury | 85,791 | Community | Groundwater under influence of surface water |
| Sergeant Bluff Water Supply | Woodbury | 5,015 | Community | Groundwater |
| Moville Water Supply | Woodbury | 1,687 | Community | Groundwater |
| Sloan Water Supply | Woodbury | 1,042 | Community | Groundwater |
| Lawton Water Supply | Woodbury | 988 | Community | Groundwater |
| Correctionville Water Supply | Woodbury | 766 | 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, “Pierson Water Supply, PWSID IA9766041, Iowa”, https://aquacensus.com/water-systems/iowa/pierson-water-supply-ia9766041 (data as of October 1, 2026).