Public water system record
Larchwood Water Supply
Serves Larchwood, Lyon County, IA · 926 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Larchwood Water Supply in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Larchwood Water Supply buys its water from Lyon-Sioux RWS-Big Sioux.
- Most recent formal enforcement: compliance order (no penalty) by Iowa, December 1990.
- Record on file since 1986, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 421 service lines.
Check whether Larchwood Water Supply serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Active |
Full record since 1986
EPA's records for Larchwood Water Supply go back to 1986. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 16 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 1 |
| 1990s | 1 | 5 |
| 2000s | 0 | 6 |
| 2010 to October 18, 2016 | 0 | 4 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began July 1991, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 1991 | Resolved |
Enforcement actions
Iowa regulators took 2 formal enforcement actions against Larchwood Water Supply in 1990, filed as 3 records in EPA's data. The most recent was a compliance order (no penalty) in December 1990.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 28, 1990 | Iowa | Compliance order (no penalty) | 2 violations: Nitrate |
| Dec 28, 1990 | Iowa | Administrative penalty | 1 violation: Nitrate |
Where the water comes from
Larchwood Water Supply buys its water from Lyon-Sioux RWS-Big Sioux. It lists no wells or intakes of its own.
Buys water from
- Lyon-Sioux RWS-Big Sioux Rock Rapids, IA
Annual water quality report
Larchwood Water Supply must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Iowa.
Certified drinking water labs by state EPA guidance for private wells