Larchwood, IA
Contamination score
Higher = more contaminated vs. other cities.
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Reported illness & cancer claims
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Self-reported issues
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Pollution sources & reported claims near your water
Factories, greenhouses, and contaminated sites mapped around the water supply. Tap any circle for detail.
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Public water systems
Lyon-Sioux Rws-Big Sioux
- PWSID:
- IA6000755
- Source:
- Ground water
- Serves:
- 1,530 people
Larchwood Water Supply
- PWSID:
- IA6050059
- Source:
- Ground water
- Serves:
- 926 people
EPA & DEP violations
Lyon-Sioux Rws-Big Sioux
PWSID IA60007554 violationsNitrite — MR violation
medium severityResolvedNitrite MR violation (Resolved).
EPA SDWIS · MR · Began Oct 1, 2019 · 6 years ago · Source ↗
Combined Radium (-226 and -228) — MR violation
medium severityResolvedCombined Radium (-226 and -228) MR violation (Resolved).
EPA SDWIS · MR · Began Jul 1, 2012 · 14 years ago · Source ↗
Nitrate — MR violation
medium severityResolvedNitrate MR violation (Resolved).
EPA SDWIS · MR · Began Jul 1, 2010 · 16 years ago · Source ↗
Violation — Violation violation
medium severityContaminant Violation violation.
EPA SDWIS · Violation · Began — · Source ↗
City-wide
6 violationsConsumer Confidence Rule — Other violation
medium severityResolvedConsumer Confidence Rule Other violation (Resolved).
EPA SDWIS · Other · Began Jul 1, 2025 · 1 year ago · Source ↗
Total Haloacetic Acids (HAA5) — MR violation
medium severityResolvedTotal Haloacetic Acids (HAA5) MR violation (Resolved).
EPA SDWIS · MR · Began Jul 1, 2013 · 13 years ago · Source ↗
TTHM — MR violation
medium severityResolvedTTHM MR violation (Resolved).
EPA SDWIS · MR · Began Jul 1, 2013 · 13 years ago · Source ↗
Coliform (TCR) — MR violation
medium severityResolvedColiform (TCR) MR violation (Resolved).
EPA SDWIS · MR · Began Nov 1, 2010 · 15 years ago · Source ↗
Chlorine — MR violation
medium severityResolvedChlorine MR violation (Resolved).
EPA SDWIS · MR · Began Oct 1, 2010 · 15 years ago · Source ↗
Violation — Violation violation
medium severityContaminant Violation violation.
EPA SDWIS · Violation · Began — · Source ↗
Water-related lawsuits
No lawsuits on record.
In the news & sources
No coverage linked yet.