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KEYSTONE WATER SUPPLY

PWS ID: IA0640030 · KEYSTONE, Iowa 52249

KEYSTONE WATER SUPPLY serves 599 people in KEYSTONE, Iowa using Groundwater water sources. It has 142 recorded EPA violations, including 25 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: KEYSTONE WATER SUPPLY

KEYSTONE WATER SUPPLY is a local-owned community water system that delivers drinking water to 599 residents in KEYSTONE, Iowa (Benton County) through 280 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 142 total violations for this system , of which 25 (18%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 78 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Nitrite, recorded in 25 violations (MR). 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. KEYSTONE WATER SUPPLY's 142 violations sit above the Iowa average. Statewide, 127 of 152 UCMR5-tested systems have reported PFAS detections (83.6%). 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
599
Total Violations
142
Health-Based Violations
25
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
280
County
Benton
School/Daycare
No
MCL Violations
23
Monitoring Violations
78
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrite MR 25 2015
Nitrite MCL 23 2021
Nitrate MR 20 2018
Toluene MR 8 2013
Coliform (TCR) MR 8 2013
Lead and Copper Rule MR 4 2018
Public Notice Other 4 2013
Groundwater Rule TT 2 2021
Barium MR 2 1988
Chromium MR 2 1988
Selenium MR 2 1988
Cadmium MR 2 1988
Arsenic MR 2 1988
Fluoride MR 2 1988
Mercury MR 1 1988

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 KEYSTONE 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 IA0640030 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
2021 Nitrite MCL 23 SDWIS / IA0640030 / 1041
2021 Groundwater Rule TT 2 SDWIS / IA0640030 / 0700
2018 Nitrate MR 20 SDWIS / IA0640030 / 1040
2018 Lead and Copper Rule MR 4 SDWIS / IA0640030 / 5000
2015 Nitrite MR 25 SDWIS / IA0640030 / 1041
2013 Toluene MR 8 SDWIS / IA0640030 / 2991
2013 Coliform (TCR) MR 8 SDWIS / IA0640030 / 3100
2013 Public Notice Other 4 SDWIS / IA0640030 / 7500
1988 Barium MR 2 SDWIS / IA0640030 / 1010
1988 Chromium MR 2 SDWIS / IA0640030 / 1020
1988 Selenium MR 2 SDWIS / IA0640030 / 1045
1988 Cadmium MR 2 SDWIS / IA0640030 / 1015
1988 Arsenic MR 2 SDWIS / IA0640030 / 1005
1988 Fluoride MR 2 SDWIS / IA0640030 / 1025
1988 Mercury MR 1 SDWIS / IA0640030 / 1035

How KEYSTONE WATER SUPPLY Compares

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

Metric KEYSTONE WATER SUPPLY Iowa avg Federal benchmark
Total violations 142 77 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 25 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 599 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is KEYSTONE WATER SUPPLY water safe to drink? ▼
KEYSTONE WATER SUPPLY (PWS ID: IA0640030) has 142 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 599 people using Groundwater sources.
How many people does KEYSTONE WATER SUPPLY serve? ▼
KEYSTONE WATER SUPPLY serves 599 people in KEYSTONE, Iowa. It is a Local-owned system using Groundwater water sources with 280 service connections.
What type of violations does KEYSTONE WATER SUPPLY have? ▼
KEYSTONE WATER SUPPLY has 142 total violations: 25 health-based violations (MCL exceedances or treatment failures), 78 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in KEYSTONE WATER SUPPLY water? ▼
No PFAS testing data is available for KEYSTONE WATER SUPPLY under the EPA's UCMR5 monitoring program.
What water source does KEYSTONE WATER SUPPLY use? ▼
KEYSTONE 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial