Is OASIS MHP required to publish a Consumer Confidence Report?

Yes. OASIS MHP 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 OASIS MHP’s next Consumer Confidence Report due?

OASIS MHP’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.

NORTHBROOK, IL · Cook County

OASIS MHP Water System

Consumer Confidence Report status

OASIS MHP 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 OASIS MHP.

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): IL0315185
System type: Community Water System
Population served: 3,000
Service connections: 599
Ownership: privately owned
Water source: groundwater (wells)

OASIS MHP is one of 773 community water systems in Illinois in the 501 to 3,300 people size category, serving 3,000 people from groundwater.

As of August 1, 2026, its federal record holds 20 entries between 1993 and 2021, all of which EPA lists as closed. Nothing has been added since 2021.

Of the 20, 15 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 Total Coliform Rules, and the Stage 2 Disinfectants and Disinfection Byproducts Rule.

Violation history

Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
September 1, 2021 – August 31, 2022
Resolved
Monitoring and Reporting (DBP)
—
TTHM
September 1, 2021 – August 31, 2022
Resolved
Monitoring, Regular
—
Mercury
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Barium
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Selenium
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Nickel
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2017 – December 31, 2025
Archived
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – July 13, 2012
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
April 1, 2011 – June 1, 2011
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 1997 – April 30, 1997
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
February 1, 1997 – February 28, 1997
Archived
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
February 1, 1997 – February 28, 1997
Archived
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
September 1, 1993 – September 30, 1993
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1993 – September 30, 1993
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 1993 – August 31, 1993
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
September 1, 2021 – August 31, 2022	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
September 1, 2021 – August 31, 2022	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Mercury	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Barium	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Selenium	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Nickel	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Cadmium	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2017 – December 31, 2025	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived
July 1, 2012 – July 13, 2012	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
April 1, 2011 – June 1, 2011	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
April 1, 1997 – April 30, 1997	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
February 1, 1997 – February 28, 1997	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
February 1, 1997 – February 28, 1997	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Archived
September 1, 1993 – September 30, 1993	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1993 – September 30, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
August 1, 1993 – August 31, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived

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

Enforcement actions

January 14, 2026State Public Notification requested1 linked violation
January 14, 2026State Violation/Reminder Notice1 linked violation
January 14, 2026State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
January 14, 2026State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 2, 2024State Compliance achieved8 linked violations
September 8, 2023State Compliance achieved2 linked violations
June 23, 2023State Compliance achieved1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification received2 linked violations
May 22, 2023State Public Notification received1 linked violation
May 22, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
February 8, 2023State Public Notification requested1 linked violation
February 8, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 7, 2023State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
February 7, 2023State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 7, 2023State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 7, 2023State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
February 7, 2023State Violation/Reminder Notice1 linked violation
February 7, 2023State Public Notification requested1 linked violation
October 17, 2022State Public Notification requested2 linked violations
October 17, 2022State Violation/Reminder Notice2 linked violations
July 13, 2012State Compliance achieved1 linked violation
July 12, 2012State Violation/Reminder Notice1 linked violation
June 1, 2011State Compliance achieved1 linked violation
May 26, 2011State Public Notification received1 linked violation
May 16, 2011State Public Notification requested1 linked violation
May 16, 2011State Violation/Reminder Notice1 linked violation
July 10, 1997State Public Notification received1 linked violation
June 21, 1997State Violation/Reminder Notice1 linked violation
June 21, 1997State Public Notification requested1 linked violation
April 17, 1997State Public Notification requested2 linked violations
April 17, 1997State Violation/Reminder Notice2 linked violations
April 10, 1997State Public Notification received2 linked violations
October 23, 1993State Violation/Reminder Notice1 linked violation
October 23, 1993State Public Notification requested1 linked violation
October 23, 1993State Public Notification requested1 linked violation
October 23, 1993State Violation/Reminder Notice2 linked violations
October 23, 1993State Violation/Reminder Notice3 linked violations
October 21, 1993State Public Notification received2 linked violations
October 21, 1993State Public Notification received1 linked violation
October 21, 1993State Public Notification received1 linked violation
September 26, 1993State Violation/Reminder Notice2 linked violations
September 26, 1993State Public Notification requested2 linked violations
September 7, 1993State Public Notification received2 linked violations
December 26, 1992State Public Notification requested3 linked violations
December 26, 1992State Violation/Reminder Notice3 linked violations
December 21, 1992State Public Notification received3 linked violations

Common questions

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

BARRON, JOSH

847-827-6694

NORTHBROOK, IL 60062