ROCK VALLEY, IA · Sioux County
ROCK VALLEY WATER SUPPLY Water System
Consumer Confidence Report status
ROCK VALLEY WATER SUPPLY must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for ROCK VALLEY WATER SUPPLY.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.
System facts
- System ID (PWSID)
- IA8482096
- System type
- Community Water System
- Population served
- 4,059
- Service connections
- 1,866
- Ownership
- local government
- Water source
- groundwater (wells)
ROCK VALLEY WATER SUPPLY is one of 91 community water systems in Iowa in the 3,301 to 10,000 people size category, serving 4,059 people from groundwater.
As of August 1, 2026, its federal record holds 5 entries between 1991 and 2024, all of which EPA lists as closed.
Of the 5, 3 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Total Coliform Rules.
Violation history
Monitoring and Reporting (DBP)
—TTHM
August 1, 2024 – August 31, 2024
ResolvedMaximum Contaminant Level Violation, Single Sample
Health-basedNitrate
May 1, 2000 – May 31, 2000
ResolvedMaximum Contaminant Level Violation, Single Sample
Health-basedNitrate
December 1, 1999 – December 31, 1999
ResolvedMonitoring, Regular
—Nitrate
January 1, 1995 – March 31, 1995
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
January 1, 1991 – January 31, 1991
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| August 1, 2024 – August 31, 2024 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| May 1, 2000 – May 31, 2000 | Maximum Contaminant Level Violation, Single Sample | Nitrate | Health-based | Resolved |
| December 1, 1999 – December 31, 1999 | Maximum Contaminant Level Violation, Single Sample | Nitrate | Health-based | Resolved |
| January 1, 1995 – March 31, 1995 | Monitoring, Regular | Nitrate | — | Resolved |
| January 1, 1991 – January 31, 1991 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- August 5, 2025State Compliance achieved2 linked violations
- June 12, 2025State Public Notification received2 linked violations
- October 18, 2024State Formal Notice of Violation issued2 linked violations
- February 10, 2003State Compliance achieved4 linked violations
- October 4, 2002State Public Notification received4 linked violations
- August 14, 2002State Public Notification requested11 linked violations
- August 14, 2002State Formal Notice of Violation issued5 linked violations
- October 15, 2001State Compliance achieved7 linked violations
- June 11, 2001State Compliance achieved6 linked violations
- June 11, 2001State Compliance achieved5 linked violations
- May 24, 2001State Bilateral Compliance Agreement signed2 linked violations
- May 24, 2001State Bilateral Compliance Agreement signed2 linked violations
- August 23, 2000State Public Notification received3 linked violations
- August 10, 2000State Formal Notice of Violation issued2 linked violations
- May 12, 2000State Formal Notice of Violation issued5 linked violations
- December 9, 1999State Formal Notice of Violation issued4 linked violations
- June 14, 1999State Compliance achieved3 linked violations
- March 31, 1999State Bilateral Compliance Agreement signed5 linked violations
- August 10, 1998State Public Notification requested3 linked violations
- May 14, 1998State Compliance achieved1 linked violation
- October 17, 1997State Public Notification requested1 linked violation
- May 12, 1997State Compliance achieved1 linked violation
- August 21, 1995State Compliance achieved6 linked violations
- March 26, 1991State Public Notification received1 linked violation
- February 19, 1991State Compliance achieved2 linked violations
- May 1, 1989State Compliance achieved2 linked violations
- July 20, 1988State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
- June 6, 1988State Compliance achievedgeneral compliance action — not tied to a specific violation on record
- February 16, 1988State Public Notification requested2 linked violations
- September 30, 1984Federal issued Formal Notice of Violationgeneral compliance action — not tied to a specific violation on record
- February 16, 1982State Unresolved1 linked violation
Common questions
Is ROCK VALLEY WATER SUPPLY required to publish a Consumer Confidence Report?
- Yes. ROCK VALLEY WATER SUPPLY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is ROCK VALLEY WATER SUPPLY’s next Consumer Confidence Report due?
- ROCK VALLEY WATER SUPPLY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does ROCK VALLEY WATER SUPPLY have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for ROCK VALLEY WATER SUPPLY.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
ROCK VALLEY WATER SUPPLY
712-470-1936
ROCK VALLEY, IA 51247