CEDAR RAPIDS, IA · Linn County

TWIN KNOLLS 6TH ADDITION Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of September 29, 2009. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in Linn County, IA.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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): IA5784310
System type: Community Water System
Population served: 45
Service connections: 15
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 2007 – June 30, 2007
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 2004 – May 31, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 1993 – March 31, 1993
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 1989 – February 13, 1991
Resolved
Monitoring, Regular
—
Selenium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Chromium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Cadmium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Barium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Arsenic
September 30, 1980 – September 29, 1983
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
June 1, 2007 – June 30, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 2004 – May 31, 2004	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
March 1, 1993 – March 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 1989 – February 13, 1991	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Selenium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Chromium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Cadmium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Barium	—	Resolved
September 30, 1980 – September 29, 1983	Monitoring, Regular	Arsenic	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

October 8, 2007State Public Notification requested4 linked violations
September 21, 2007State Formal Notice of Violation issued6 linked violations
August 13, 2007State Public Notification received5 linked violations
June 26, 2007State Violation/Reminder Notice9 linked violations
October 12, 2005State Public Notification requested5 linked violations
October 8, 2003State Compliance achieved5 linked violations
November 5, 1999State Compliance achieved8 linked violations
June 4, 1993State Public Notification received3 linked violations
June 4, 1993State Public Notification received3 linked violations
June 2, 1992State Public Notification received3 linked violations
June 2, 1992State Public Notification received1 linked violation
May 19, 1992State Public Notification requested5 linked violations
May 19, 1992State Public Notification requested1 linked violation
May 19, 1992State Formal Notice of Violation issued2 linked violations
April 30, 1992State Compliance achieved2 linked violations
February 14, 1991State Public Notification received1 linked violation
February 14, 1991State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
February 14, 1991State Public Notification received1 linked violation
February 13, 1991State Compliance achieved1 linked violation
February 13, 1991State Compliance achieved2 linked violations
February 13, 1991State Compliance achieved2 linked violations
January 30, 1991State Administrative/Compliance Order without penalty issued2 linked violations
January 30, 1991State Administrative/Compliance Order without penalty issued2 linked violations
January 30, 1991State Administrative Penalty assessed3 linked violations
January 30, 1991State Administrative/Compliance Order without penalty issued2 linked violations
January 30, 1991State Administrative/Compliance Order without penalty issued3 linked violations

Last known contact on file (system is inactive)

TWIN KNOLLS 6TH ADDITION

319-851-7514

CEDAR RAPIDS, IA 52411