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Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IL0315185
PWS Name	OASIS MHP
PWS Type	Community water system
Owner Type	Private
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	3000
County Served	Cook

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	3790409	Returned to Compliance	01-SEP-2021	31-AUG-2022	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	3790410	Returned to Compliance	01-SEP-2021	31-AUG-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Thallium, Total	3790416	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	3790414	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	3790420	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Total Polychlorinated Biphenyls (PCB)	3790422	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	3790421	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Beryllium, Total	3790417	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	3790411	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	3790419	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Inorganic Chemicals	Nickel	3790418	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3790427	Known	01-JAN-2017	31-DEC-2025	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	3790407	Returned to Compliance	01-JUL-2012	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	3790406	Returned to Compliance	01-APR-2011	30-JUN-2011	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	3788497	Known	01-APR-1997	30-APR-1997	No
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	3700597	Known	01-FEB-1997	28-FEB-1997	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3700697	Known	01-FEB-1997	28-FEB-1997	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1917693	Known	01-SEP-1993	30-SEP-1993	Yes
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	1917793	Known	01-SEP-1993	30-SEP-1993	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1917593	Known	01-AUG-1993	31-AUG-1993	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1917893	Known	01-AUG-1993	31-AUG-1993	No
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	1625793	Known	01-NOV-1992	30-NOV-1992	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1625993	Known	01-NOV-1992	30-NOV-1992	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1625893	Known	01-NOV-1992	30-NOV-1992	Yes

1 - 24 of 24

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
6498346	3790420	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790419	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790418	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790417	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790416	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790421	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790411	SOX	State Compliance achieved	02-FEB-2024	State	-
6498346	3790414	SOX	State Compliance achieved	02-FEB-2024	State	-
6498332	3790409	SOX	State Compliance achieved	08-SEP-2023	State	-
6498332	3790410	SOX	State Compliance achieved	08-SEP-2023	State	-
6498331	3790422	SOX	State Compliance achieved	23-JUN-2023	State	-
6498303	3790407	SOX	State Compliance achieved	13-JUL-2012	State	-
6498301	3790406	SOX	State Compliance achieved	01-JUN-2011	State	-
6498297	3788497	SIF	State Public Notification received	10-JUL-1997	State	-
6333797	3700697	SIE	State Public Notification requested	17-APR-1997	State	-
6333797	3700597	SIE	State Public Notification requested	17-APR-1997	State	-
2294394	1917693	SIA	State Violation/Reminder Notice	23-OCT-1993	State	-
2294594	1917793	SIA	State Violation/Reminder Notice	23-OCT-1993	State	-
2294494	1917593	SIF	State Public Notification received	21-OCT-1993	State	-
2294094	1917893	SIF	State Public Notification received	21-OCT-1993	State	-
1458893	1625793	SIE	State Public Notification requested	26-DEC-1992	State	-
1458893	1625893	SIE	State Public Notification requested	26-DEC-1992	State	-
1458893	1625993	SIE	State Public Notification requested	26-DEC-1992	State	-

1 - 23 of 23

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL 4 (20635) ABANDONED	20343	Yes	Well	Ground water	Other	Inactive
WELL 3 (20634)	20342	Yes	Well	Ground water	Permanent	Active
WELL 2 (20633)	20341	Yes	Well	Ground water	Permanent	Active
WELL 1 (20632)	20340	Yes	Well	Ground water	Permanent	Active
OASIS MHP	23442	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27101	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29523	No	Sampling Station	-	-	Active
177,000 STANDPIPE STORAGE	33363	No	Storage	-	-	Active
DISTRIBUTION PRESSURE STORAGE	13264	No	Storage	-	-	Inactive
TP 01-WELL 1	14989	No	Treatment Plant	-	-	Active
TP 02-WELL 2	14990	No	Treatment Plant	-	-	Active
TP 03-WELL 3	14991	No	Treatment Plant	-	-	Active

1 - 12 of 12

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01-WELL 1	14989	Hypochlorination, Post	Disinfection
TP 02-WELL 2	14990	Hypochlorination, Post	Disinfection
TP 03-WELL 3	14991	Hypochlorination, Post	Disinfection

1 - 3 of 3

For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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