Is RIO required to publish a Consumer Confidence Report?

Yes. RIO 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 RIO’s next Consumer Confidence Report due?

RIO’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

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.

RIO, IL · Knox County

RIO Water System

Consumer Confidence Report status

RIO 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 RIO.

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): IL0950450
System type: Community Water System
Population served: 265
Service connections: 106
Ownership: local government
Water source: groundwater (wells)

RIO is one of 1,572 community water systems in Illinois in the 500 or fewer people size category, serving 265 people from groundwater.

As of August 1, 2026, its federal record holds 27 entries between 1977 and 1995, all of which EPA lists as closed. Nothing has been added since 1995.

Of the 27, 26 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 volatile organic chemicals, the Total Coliform Rules, and the Lead and Copper Rule.

Violation history

Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 1995 – January 27, 1997
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1995 – September 30, 1995
Archived
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Carbon tetrachloride
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Trichloroethylene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Tetrachloroethylene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
CHLOROBENZENE
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Benzene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Toluene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Ethylbenzene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Styrene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
Xylenes, Total
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
April 1, 1994 – June 30, 1994
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1993 – January 31, 1993
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1991 – September 30, 1991
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 1991 – July 31, 1991
Archived
Maximum Contaminant Level Violation, Average
Health-based
Fluoride
December 3, 1981 – December 2, 1984
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
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
October 1, 1995 – January 27, 1997	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
September 1, 1995 – September 30, 1995	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
July 1, 1994 – December 31, 1994	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Carbon tetrachloride	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Trichloroethylene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Tetrachloroethylene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	CHLOROBENZENE	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Benzene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Toluene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Ethylbenzene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Styrene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	Xylenes, Total	—	Resolved
April 1, 1994 – June 30, 1994	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 1993 – January 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1991 – September 30, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
July 1, 1991 – July 31, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
December 3, 1981 – December 2, 1984	Maximum Contaminant Level Violation, Average	Fluoride	Health-based	Archived
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

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

Enforcement actions

December 18, 2009State Public Notification received1 linked violation
June 1, 2009State Compliance achieved1 linked violation
December 16, 2008State Public Notification requested1 linked violation
December 16, 2008State Violation/Reminder Notice1 linked violation
January 27, 1997State Compliance achieved1 linked violation
December 2, 1995State Public Notification requested1 linked violation
December 2, 1995State Violation/Reminder Notice1 linked violation
December 31, 1994State Compliance achieved1 linked violation
September 3, 1994State Violation/Reminder Notice1 linked violation
September 3, 1994State Violation/Reminder Notice1 linked violation
August 4, 1994State Public Notification received1 linked violation
August 4, 1994State Public Notification received2 linked violations
July 14, 1994State Public Notification requested20 linked violations
July 14, 1994State Violation/Reminder Notice20 linked violations
May 21, 1994State Public Notification requested1 linked violation
May 21, 1994State Violation/Reminder Notice2 linked violations
May 21, 1994State Public Notification requested2 linked violations
May 21, 1994State Violation/Reminder Notice1 linked violation
March 30, 1993State Public Notification received1 linked violation
March 14, 1993State Public Notification requested1 linked violation
March 14, 1993State Violation/Reminder Notice1 linked violation
December 12, 1992State Violation/Reminder Notice1 linked violation
December 12, 1992State Public Notification requested1 linked violation
November 23, 1992State Public Notification received1 linked violation
November 9, 1991State Violation/Reminder Notice1 linked violation
November 9, 1991State Public Notification requested1 linked violation
November 5, 1991State Public Notification received1 linked violation
September 15, 1991State Public Notification requested1 linked violation
September 15, 1991State Violation/Reminder Notice1 linked violation
October 16, 1989State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
September 17, 1989State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
November 14, 1985State Compliance achieved1 linked violation

Common questions

Is RIO required to publish a Consumer Confidence Report?: Yes. RIO 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 RIO’s next Consumer Confidence Report due?: RIO’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does RIO have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for RIO.
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

SHULL, BOB L.

309-373-9858

RIO, IL 61472