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Community Water System · PWS IA8434040

Hawarden Water Supply

Hawarden, Iowa 51023 - drinking water served from groundwater sources to 2,700 people, tracked in EPA SDWIS and UCMR5.

2,700
People served
173
EPA violations
36
Health-based
Untested
UCMR5 result

The verdict

EPA records 173 drinking-water violations at Hawarden Water Supply, 21% of them health-based - above the Iowa per-system average.

173
Total EPA violations on record
21%
Health-based (MCL / treatment failure)
2,700
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hawarden Water Supply

Hawarden Water Supply is a local-owned community water system that delivers drinking water to 2,700 residents in Hawarden, Iowa (Sioux County) through 1,058 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 173 total violations for this system , of which 36 (21%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 85 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 36 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Iowa, EPA tracks 1,795 public water systems serving 3,114,444 people, with 138,271 cumulative violations and 27,946 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 77 violations. Statewide, 127 of 152 UCMR5-tested systems have reported PFAS detections (83.6%).

Hawarden Water Supply's 173 violations sit above the Iowa average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
2,700
Total Violations
173
Health-Based Violations
36
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,058
County
Sioux
School/Daycare
No
MCL Violations
36
Monitoring Violations
85
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 36 1999
Coliform (TCR) MR 10 2006
Cadmium MR 6 1988
Lead and Copper Rule MR 6 1991
Mercury MR 6 1988
Arsenic MR 6 1988
Chromium MR 6 1988
Fluoride MR 6 1988
Selenium MR 6 1988
Nitrate MR 5 1996
1,2,4-Trichlorobenzene MR 5 1995
BHC-GAMMA MR 5 1995
Total Haloacetic Acids (HAA5) MR 4 2018
TTHM MR 4 2018
Antimony, Total MR 4 1992
Barium MR 3 1988
Chlorine MR 3 2006

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Hawarden Water Supply.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID IA8434040 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Iowa Drinking Water Authority

Iowa's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find IA regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2018 Total Haloacetic Acids (HAA5) MR 4 SDWIS / IA8434040 / 2456
2018 TTHM MR 4 SDWIS / IA8434040 / 2950
2006 Coliform (TCR) MR 10 SDWIS / IA8434040 / 3100
2006 Chlorine MR 3 SDWIS / IA8434040 / 0999
1999 Coliform (TCR) MCL 36 SDWIS / IA8434040 / 3100
1996 Nitrate MR 5 SDWIS / IA8434040 / 1040
1995 1,2,4-Trichlorobenzene MR 5 SDWIS / IA8434040 / 2378
1995 BHC-GAMMA MR 5 SDWIS / IA8434040 / 2010
1992 Antimony, Total MR 4 SDWIS / IA8434040 / 1074
1991 Lead and Copper Rule MR 6 SDWIS / IA8434040 / 5000
1988 Cadmium MR 6 SDWIS / IA8434040 / 1015
1988 Mercury MR 6 SDWIS / IA8434040 / 1035
1988 Arsenic MR 6 SDWIS / IA8434040 / 1005
1988 Chromium MR 6 SDWIS / IA8434040 / 1020
1988 Fluoride MR 6 SDWIS / IA8434040 / 1025

How Hawarden Water Supply Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Hawarden Water Supply Iowa avg Federal benchmark
Total violations 173 77 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 36 15.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 83.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,700 1,735 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,795 regulated public water systems in Iowa.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Hawarden Water Supply water safe to drink? ▼
Hawarden Water Supply (PWS ID: IA8434040) has 173 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,700 people using Groundwater sources.
How many people does Hawarden Water Supply serve? ▼
Hawarden Water Supply serves 2,700 people in Hawarden, Iowa. It is a Local-owned system using Groundwater water sources with 1,058 service connections.
What type of violations does Hawarden Water Supply have? ▼
Hawarden Water Supply has 173 total violations: 36 health-based violations (MCL exceedances or treatment failures), 85 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hawarden Water Supply water? ▼
No PFAS testing data is available for Hawarden Water Supply under the EPA's UCMR5 monitoring program.
What water source does Hawarden Water Supply use? ▼
Hawarden Water Supply uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.