PlainWater
States → Iowa

TWIN VALLEY LAKES IMPROVEMENT ASSN

PWS ID: IA5200861 · SOLON, Iowa 52333-9324

TWIN VALLEY LAKES IMPROVEMENT ASSN serves 100 people in SOLON, Iowa using Groundwater water sources. It has 174 recorded EPA violations, including 65 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: TWIN VALLEY LAKES IMPROVEMENT ASSN

TWIN VALLEY LAKES IMPROVEMENT ASSN is a private-owned community water system that delivers drinking water to 100 residents in SOLON, Iowa (Johnson County) through 40 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 174 total violations for this system , of which 65 (37%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 89 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 65 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. TWIN VALLEY LAKES IMPROVEMENT ASSN's 174 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
100
Total Violations
174
Health-Based Violations
65
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
40
County
Johnson
School/Daycare
No
MCL Violations
65
Monitoring Violations
89
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 65 2010
Lead and Copper Rule MR 15 2020
Mercury MR 8 1988
Consumer Confidence Rule Other 7 2022
Chromium MR 7 1988
Fluoride MR 7 1988
Gross Alpha, Excl. Radon and U MR 7 1987
Barium MR 7 1988
Cadmium MR 7 1988
Arsenic MR 7 1988
Selenium MR 7 1988
Nitrate MR 5 1985
Revised Total Coliform Rule MON 4 2019
Coliform (TCR) MR 4 2012
Total Haloacetic Acids (HAA5) MR 2 2025
TTHM MR 2 2025

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 TWIN VALLEY LAKES IMPROVEMENT ASSN.

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 IA5200861 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
2025 Total Haloacetic Acids (HAA5) MR 2 SDWIS / IA5200861 / 2456
2025 TTHM MR 2 SDWIS / IA5200861 / 2950
2022 Consumer Confidence Rule Other 7 SDWIS / IA5200861 / 7000
2020 Lead and Copper Rule MR 15 SDWIS / IA5200861 / 5000
2019 Revised Total Coliform Rule MON 4 SDWIS / IA5200861 / 8000
2012 Coliform (TCR) MR 4 SDWIS / IA5200861 / 3100
2010 Coliform (TCR) MCL 65 SDWIS / IA5200861 / 3100
1988 Mercury MR 8 SDWIS / IA5200861 / 1035
1988 Chromium MR 7 SDWIS / IA5200861 / 1020
1988 Fluoride MR 7 SDWIS / IA5200861 / 1025
1988 Barium MR 7 SDWIS / IA5200861 / 1010
1988 Cadmium MR 7 SDWIS / IA5200861 / 1015
1988 Arsenic MR 7 SDWIS / IA5200861 / 1005
1988 Selenium MR 7 SDWIS / IA5200861 / 1045
1987 Gross Alpha, Excl. Radon and U MR 7 SDWIS / IA5200861 / 4000

How TWIN VALLEY LAKES IMPROVEMENT ASSN Compares

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

Metric TWIN VALLEY LAKES IMPROVEMENT ASSN Iowa avg Federal benchmark
Total violations 174 77 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 65 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 100 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 TWIN VALLEY LAKES IMPROVEMENT ASSN water safe to drink? ▼
TWIN VALLEY LAKES IMPROVEMENT ASSN (PWS ID: IA5200861) has 174 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 100 people using Groundwater sources.
How many people does TWIN VALLEY LAKES IMPROVEMENT ASSN serve? ▼
TWIN VALLEY LAKES IMPROVEMENT ASSN serves 100 people in SOLON, Iowa. It is a Private-owned system using Groundwater water sources with 40 service connections.
What type of violations does TWIN VALLEY LAKES IMPROVEMENT ASSN have? ▼
TWIN VALLEY LAKES IMPROVEMENT ASSN has 174 total violations: 65 health-based violations (MCL exceedances or treatment failures), 89 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in TWIN VALLEY LAKES IMPROVEMENT ASSN water? ▼
No PFAS testing data is available for TWIN VALLEY LAKES IMPROVEMENT ASSN under the EPA's UCMR5 monitoring program.
What water source does TWIN VALLEY LAKES IMPROVEMENT ASSN use? ▼
TWIN VALLEY LAKES IMPROVEMENT ASSN 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.

Explore PlainWater

Water in Iowa

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for Iowa

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
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.

Related

Browse all → | Rankings →
Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial