Is ONSLOW WATER SUPPLY required to publish a Consumer Confidence Report?

Yes. ONSLOW 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 ONSLOW WATER SUPPLY’s next Consumer Confidence Report due?

ONSLOW WATER SUPPLY’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.

WYOMING, IA · Jones County

ONSLOW WATER SUPPLY Water System

Consumer Confidence Report status

ONSLOW 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 ONSLOW 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): IA5358096
System type: Community Water System
Population served: 201
Service connections: 110
Ownership: local government
Water source: groundwater (wells)

ONSLOW WATER SUPPLY is one of 1,221 community water systems in Iowa in the 500 or fewer people size category, serving 201 people from groundwater.

As of August 1, 2026, its federal record holds 18 entries between 1985 and 2017, all of which EPA lists as closed. Nothing has been added since 2017.

Of the 18, 17 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 Lead and Copper Rule, and the Consumer Confidence Rule.

Violation history

Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2017 – October 27, 2017
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2002 – July 31, 2002
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 1989 – September 26, 1990
Resolved
Monitoring, Regular
—
Cadmium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Arsenic
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Barium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Chromium
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Fluoride
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Mercury
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Nitrate
April 1, 1987 – March 31, 1990
Resolved
Monitoring, Regular
—
Selenium
April 1, 1987 – March 31, 1990
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 1986 – March 25, 1987
Resolved
Monitoring, Regular
—
Fluoride
July 1, 1985 – June 30, 1988
Resolved
Monitoring, Regular
—
Chromium
July 1, 1985 – June 30, 1988
Resolved
Monitoring, Regular
—
Barium
July 1, 1985 – June 30, 1988
Resolved
Monitoring, Regular
—
Cadmium
July 1, 1985 – June 30, 1988
Resolved
Monitoring, Regular
—
Arsenic
July 1, 1985 – June 30, 1988
Resolved
Monitoring, Regular
—
Selenium
July 1, 1985 – June 30, 1988
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2017 – October 27, 2017	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2002 – July 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 1989 – September 26, 1990	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Cadmium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Arsenic	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Barium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Chromium	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Fluoride	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Mercury	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Nitrate	—	Resolved
April 1, 1987 – March 31, 1990	Monitoring, Regular	Selenium	—	Resolved
October 1, 1986 – March 25, 1987	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Fluoride	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Chromium	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Barium	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Cadmium	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Arsenic	—	Resolved
July 1, 1985 – June 30, 1988	Monitoring, Regular	Selenium	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

January 20, 2023State Public Notification requested4 linked violations
August 28, 2020State Public Notification received3 linked violations
October 3, 2019State Compliance achieved3 linked violations
August 7, 2017State Public Notification requested27 linked violations
August 7, 2017State Formal Notice of Violation issued3 linked violations
January 16, 2015State Public Notification received4 linked violations
November 18, 2014State Formal Notice of Violation issued2 linked violations
October 3, 2002State Compliance achieved9 linked violations
May 23, 2001State Compliance achieved4 linked violations
December 21, 2000State Compliance achieved4 linked violations
October 26, 2000State Compliance achieved4 linked violations
August 31, 2000State Formal Notice of Violation issued4 linked violations
December 23, 1996State Compliance achievedgeneral compliance action — not tied to a specific violation on record
December 23, 1996State Compliance achievedgeneral compliance action — not tied to a specific violation on record
December 9, 1996State Compliance achieved21 linked violations
December 9, 1996State Compliance achieved1 linked violation
December 9, 1996State Compliance achieved3 linked violations
November 15, 1996State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
November 15, 1996State Formal Notice of Violation issued3 linked violations
November 15, 1996State Public Notification requested5 linked violations
November 15, 1996State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
November 15, 1996State Formal Notice of Violation issued1 linked violation
November 15, 1996State Public Notification requested1 linked violation
November 15, 1996State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
November 15, 1996State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
October 1, 1990State Administrative/Compliance Order without penalty issuedgeneral compliance action — not tied to a specific violation on record
October 1, 1990State Administrative/Compliance Order without penalty issued3 linked violations
October 1, 1990State Administrative/Compliance Order without penalty issued1 linked violation
October 1, 1990State Administrative/Compliance Order without penalty issued2 linked violations
October 1, 1990State Administrative/Compliance Order without penalty issued1 linked violation
September 26, 1990State Compliance achieved1 linked violation
September 26, 1990State Compliance achieved2 linked violations
September 26, 1990State Compliance achievedgeneral compliance action — not tied to a specific violation on record
September 26, 1990State Compliance achieved2 linked violations
September 26, 1990State Compliance achieved1 linked violation
September 26, 1990State Compliance achieved1 linked violation
July 31, 1989State Compliance achievedgeneral compliance action — not tied to a specific violation on record
June 19, 1989State Formal Notice of Violation issued1 linked violation
May 30, 1989State Compliance achievedgeneral compliance action — not tied to a specific violation on record
January 11, 1988State Compliance achieved1 linked violation
January 2, 1988State Public Notification requested1 linked violation
January 2, 1988State Formal Notice of Violation issued2 linked violations
October 15, 1987State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
October 15, 1987State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
March 25, 1987State Compliance achieved2 linked violations
March 25, 1987State Compliance achievedgeneral compliance action — not tied to a specific violation on record
March 25, 1987State Compliance achieved1 linked violation
February 16, 1982State Unresolvedgeneral compliance action — not tied to a specific violation on record

Common questions

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

ONSLOW WATER SUPPLY

319-821-0124

WYOMING, IA 52362