Public water system record
Rock Valley Water Supply
Serves Rock Valley, Sioux County, IA · 4,059 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for Rock Valley Water Supply in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 2
Key facts
- Rock Valley Water Supply draws water from 6 wells.
- Most recent formal enforcement: signed compliance agreement by Iowa, May 2001.
- Record on file since 1988, with 11 health-based violations before October 19, 2016.
- Lead pipe inventory: 1 lead and 85 unknown out of 2,730 service lines.
Check whether Rock Valley 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 |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2024 | Resolved |
Full record since 1988
EPA's records for Rock Valley Water Supply go back to 1988. Before October 19, 2016 they list 11 health-based violations (11 resolved) and 5 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 1 | 0 |
| 1990s | 7 | 4 |
| 2000s | 3 | 1 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began August 2002, Resolved.
Show all 11 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 1, 2002 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 1, 2000 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
May 1, 2000 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 1, 1999 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jun 1, 1999 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 1998 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1997 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1996 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 1993 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 1988 | Resolved |
Enforcement actions
Iowa regulators took 2 formal enforcement actions against Rock Valley Water Supply between 1999 and 2001, filed as 14 records in EPA's data. The most recent was a signed compliance agreement in May 2001.
| Date | By | Action | Violations covered |
|---|---|---|---|
| May 24, 2001 | Iowa | Signed compliance agreement | 10 violations (10 health-based): Nitrate |
| Mar 31, 1999 | Iowa | Signed compliance agreement | 4 violations (4 health-based): Nitrate |
Where the water comes from
Rock Valley Water Supply draws water from 6 wells.
Annual water quality report
Rock Valley 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