DUBUQUE, IA · Dubuque County

TWIN RIDGE CORP (CITY OF DUBUQUE) Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of April 22, 2016. 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 Dubuque County, IA.

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): IA3126302
System type: Community Water System
Population served: 215
Service connections: 86
Ownership: privately owned
Water source: groundwater (wells)

TWIN RIDGE CORP (CITY OF DUBUQUE) is one of 1,221 community water systems in Iowa in the 500 or fewer people size category, formerly serving 215 people from groundwater.

EPA's federal records list this system as inactive in 2016; the record below is historical.

As of August 1, 2026, its federal record holds 10 entries between 1980 and 2011, all of which EPA lists as closed. Nothing has been added since 2011.

Of the 10, 9 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 Consumer Confidence Rule, and the Total Coliform Rules.

Violation history

Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2011 – November 1, 2011
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1992 – May 31, 1992
Resolved
Monitoring, Regular
—
Fluoride
July 1, 1986 – June 30, 1989
Resolved
Monitoring, Regular
—
Cadmium
September 30, 1980 – September 29, 1983
Archived
Monitoring, Regular
—
Chromium
September 30, 1980 – September 29, 1983
Archived
Monitoring, Regular
—
Fluoride
September 30, 1980 – September 29, 1983
Archived
Monitoring, Regular
—
Mercury
September 30, 1980 – September 29, 1983
Archived
Monitoring, Regular
—
Nitrate
September 30, 1980 – September 29, 1983
Archived
Monitoring, Regular
—
Barium
September 30, 1980 – September 29, 1983
Archived
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
July 1, 2011 – November 1, 2011	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
May 1, 1992 – May 31, 1992	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 1986 – June 30, 1989	Monitoring, Regular	Fluoride	—	Resolved
September 30, 1980 – September 29, 1983	Monitoring, Regular	Cadmium	—	Archived
September 30, 1980 – September 29, 1983	Monitoring, Regular	Chromium	—	Archived
September 30, 1980 – September 29, 1983	Monitoring, Regular	Fluoride	—	Archived
September 30, 1980 – September 29, 1983	Monitoring, Regular	Mercury	—	Archived
September 30, 1980 – September 29, 1983	Monitoring, Regular	Nitrate	—	Archived
September 30, 1980 – September 29, 1983	Monitoring, Regular	Barium	—	Archived
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

November 17, 2015State Public Notification requested2 linked violations
November 3, 2015State Compliance achieved2 linked violations
December 11, 2013State Compliance achieved2 linked violations
November 20, 2013State Public Notification received4 linked violations
November 5, 2013State Formal Notice of Violation issued2 linked violations
October 9, 2013State Public Notification requested4 linked violations
October 7, 2013State Violation/Reminder Notice3 linked violations
November 18, 1996State Public Notification requested1 linked violation
November 18, 1996State Formal Notice of Violation issued1 linked violation
June 22, 1992State Compliance achieved5 linked violations
December 19, 1990State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
September 29, 1988State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
March 1, 1982State Unresolved1 linked violation
February 19, 1982State Unresolvedgeneral compliance action — not tied to a specific violation on record
February 18, 1982State Unresolvedgeneral compliance action — not tied to a specific violation on record
February 10, 1982State Unresolved1 linked violation

Last known contact on file (system is inactive)

TWIN RIDGE CORP (CITY OF DUBUQUE)

563-589-4291

DUBUQUE, IA 52001