ROCKFORD, IL · Winnebago County

LARCHMONT SUBDIVISION Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of January 6, 2012. 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 Winnebago County, IL.

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 Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

System facts

System ID (PWSID): IL2015290
System type: Community Water System
Population served: 18
Service connections: 8
Ownership: privately owned
Water source: groundwater (wells)

LARCHMONT SUBDIVISION is one of 1,572 community water systems in Illinois in the 500 or fewer people size category, formerly serving 18 people from groundwater.

EPA's federal records list this system as inactive in 2012; the record below is historical.

As of August 1, 2026, its federal record holds 3 entries between 1977 and 1991, all of which EPA lists as closed. Nothing has been added since 1991.

Of the 3, 1 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 the Total Coliform Rules and the Radionuclides and Revised Rad Rule.

Violation history

Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
December 1, 1991 – December 31, 1991
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
December 1, 1991 – December 31, 1991
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
December 1, 1991 – December 31, 1991	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Archived
December 1, 1991 – December 31, 1991	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

February 1, 1992State Public Notification requested2 linked violations
February 1, 1992State Violation/Reminder Notice2 linked violations
January 29, 1992State Public Notification received2 linked violations
September 7, 1991State Public Notification requested1 linked violation
September 7, 1991State Violation/Reminder Notice1 linked violation
August 30, 1991State Public Notification received3 linked violations
August 3, 1991State Violation/Reminder Notice2 linked violations
November 3, 1990State Public Notification requested1 linked violation
April 25, 1990State Compliance achieved1 linked violation
January 6, 1990State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 6, 1990State Public Notification requested1 linked violation
December 30, 1989State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
October 8, 1989State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
October 8, 1989State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
October 4, 1989State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
September 9, 1989State Public Notification requested1 linked violation
September 1, 1989State Public Notification receivedgeneral compliance action — not tied to a specific violation on record

Last known contact on file (system is inactive)

KATSUMATA, SHIN

815-394-2734

ROCKFORD, IL 61107