Public water system · IA1093031
ActiveWinthrop Water Supply
At a glance
Winthrop Water Supply (PWSID IA1093031) is an active community water system in Buchanan County, Iowa. It reports serving 840 people through 380 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 1990.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
840
Service connections
380
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Winthrop Water Supply compare with other water systems in Buchanan County?
By EPA's size categories, Winthrop Water Supply is a small system (501 to 3,300 people). Buchanan County has 20 active public water systems, and Winthrop Water Supply is the 4th-largest of them by population served. Its population served is about 29% above the county average of 651 people per system, and accounts for 6.4% of the 13,026 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 Winthrop 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 Winthrop Water Supply?
EPA lists Winthrop 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. 7 of the 20 active systems in Buchanan County (35%) are also owned by a local government.
Does Winthrop Water Supply have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 1990. The violations listed here began between April 1988 and October 1990. By type: 9 monitoring and reporting. The contaminants or rules involved are Lead and Copper Rule, Selenium, Nitrate and Arsenic. EPA lists 9 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 |
|---|---|---|---|---|
| 1990-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Resolved |
| 1988-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Resolved |
All 9 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.
Winthrop Water Supply: frequently asked questions
Who runs Winthrop Water Supply?
Winthrop Water Supply (PWSID IA1093031) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Winthrop Water Supply serve?
Winthrop Water Supply reports serving 840 people through 380 service connections in Buchanan County, Iowa.
Where does Winthrop 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 Winthrop Water Supply have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 1990. 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 Winthrop 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 9 violations for this system; none is health-based, and the most recent began in October 1990. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Winthrop Water Supply's water quality report?
As a community water system, Winthrop 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 Buchanan County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Independence Water Dept | Buchanan | 6,064 | Community | Groundwater |
| Jesup Municipal Water Supply | Buchanan | 2,508 | Community | Groundwater |
| Fairbank Water Supply | Buchanan | 1,111 | Community | Purchased groundwater |
| Hazleton Water Supply | Buchanan | 713 | Community | Groundwater |
| Lamont Water Supply | Buchanan | 429 | Community | Groundwater |
| Brandon Water Supply | Buchanan | 341 | 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, “Winthrop Water Supply, PWSID IA1093031, Iowa”, https://aquacensus.com/water-systems/iowa/winthrop-water-supply-ia1093031 (data as of October 1, 2026).