Safe Drinking Water Information System (SDWIS) Federal Reporting Services

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PWS ID	IL0317765
PWS Name	BLACKHAWK ESTATES LLC
PWS Type	Community water system
Owner Type	Private
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	1238
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
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	4553828	Open	01-JUL-2025	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	4553827	Returned to Compliance	08-JUN-2024	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553826	Returned to Compliance	01-APR-2024	30-JUN-2024	Yes
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	4553823	Returned to Compliance	01-MAR-2023	31-MAR-2023	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	4553824	Returned to Compliance	01-JAN-2023	31-MAR-2023	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553822	Returned to Compliance	01-OCT-2022	31-DEC-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553821	Returned to Compliance	01-JUL-2022	30-SEP-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553820	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553819	Returned to Compliance	01-OCT-2021	31-DEC-2021	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	4553816	Returned to Compliance	01-NOV-2017	30-NOV-2017	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	4553815	Returned to Compliance	01-OCT-2017	31-DEC-2017	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	4553814	Returned to Compliance	02-JAN-2013	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	4553813	Returned to Compliance	01-JUL-2012	30-SEP-2012	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	4553812	Returned to Compliance	13-JAN-2012	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4553810	Returned to Compliance	01-JUL-2011	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4553808	Returned to Compliance	01-JUL-2010	-	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	4553807	Returned to Compliance	02-JAN-2010	-	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	4553809	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553806	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553706	Returned to Compliance	01-JUL-2005	30-SEP-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553505	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	4553405	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	4553205	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4553105	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4552705	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4552505	Returned to Compliance	01-JUL-2004	30-SEP-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4552404	Returned to Compliance	01-APR-2004	30-JUN-2004	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	4551704	Returned to Compliance	01-JAN-2004	31-MAR-2004	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4551504	Returned to Compliance	01-JAN-2004	31-MAR-2004	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4552004	Returned to Compliance	01-JAN-2004	31-MAR-2004	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4551304	Returned to Compliance	01-OCT-2003	31-DEC-2003	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4551104	Returned to Compliance	01-JUL-2003	30-SEP-2003	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4550903	Returned to Compliance	01-APR-2003	30-JUN-2003	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4550703	Returned to Compliance	01-JAN-2003	31-MAR-2003	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4550599	Known	01-AUG-1999	31-AUG-1999	No
Other	Notification, Public	Miscellaneous Other Rules	-	2V81	Known	22-JUN-1981	21-JUL-1981	No

1 - 36 of 36

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
8363464	4553828	SIA	State Violation/Reminder Notice	20-AUG-2025	State	-
8363463	4553826	SIF	State Public Notification received	24-JUN-2025	State	-
8363462	4553827	SOX	State Compliance achieved	13-MAY-2025	State	-
8363454	4553822	SIF	State Public Notification received	07-FEB-2024	State	-
8363452	4553824	SIF	State Public Notification received	24-MAY-2023	State	-
8363453	4553823	SIF	State Public Notification received	24-MAY-2023	State	-
8363443	4553821	SOX	State Compliance achieved	24-OCT-2022	State	-
8363440	4553820	SOX	State Compliance achieved	06-SEP-2022	State	-
8363437	4553819	SOX	State Compliance achieved	10-MAR-2022	State	-
8363431	4553815	SIF	State Public Notification received	26-FEB-2018	State	-
8363432	4553816	SIF	State Public Notification received	26-FEB-2018	State	-
8363425	4553813	SIF	State Public Notification received	27-JUN-2013	State	-
8363424	4553814	SOX	State Compliance achieved	18-JAN-2013	State	Received Form
8363419	4553809	SIF	State Public Notification received	02-MAR-2012	State	-
8363418	4553812	SOX	State Compliance achieved	25-FEB-2012	State	-
8363414	4553810	SIA	State Violation/Reminder Notice	16-AUG-2011	State	-
8363410	4553808	SOX	State Compliance achieved	21-JUL-2010	State	Supply issued a CCR on 7/1/10 (on time), IEPA rcvd copy 7/21/10.
8363408	4553807	SOX	State Compliance achieved	29-MAR-2010	State	-
8363406	4553806	SIF	State Public Notification received	12-DEC-2005	State	-
8363006	4553706	SIF	State Public Notification received	26-OCT-2005	State	-
8363306	4552004	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4552404	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4552505	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4552705	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4553105	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4553505	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4551504	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4551304	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4551104	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4550703	SOX	State Compliance achieved	10-OCT-2005	State	-
8363306	4550903	SOX	State Compliance achieved	10-OCT-2005	State	-
8362605	4553405	SIF	State Public Notification received	17-JUN-2005	State	-
8361805	4553205	SIF	State Public Notification received	21-APR-2005	State	-
8359604	4551704	SOX	State Compliance achieved	07-JUN-2004	State	-
8355900	4550599	SIE	State Public Notification requested	15-OCT-1999	State	-

1 - 35 of 35

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL 1 (20636) ABANDONED	20344	Yes	Well	Ground water	Other	Inactive
WELL 4 (20639)	20347	Yes	Well	Ground water	Permanent	Active
WELL 6 (01217)	19009	Yes	Well	Ground water	Permanent	Active
WELL 5 (20640)	20348	Yes	Well	Ground water	Other	Inactive
WELL 3 (20638) INACTIVE	20346	Yes	Well	Ground water	Other	Inactive
WELL 2 (20637) ABANDONED	20345	Yes	Well	Ground water	Other	Inactive
BLACKHAWK ESTATES LLC	23481	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27140	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29562	No	Sampling Station	-	-	Active
205,337 K GROUND STORAGE TANK	47178	No	Storage	-	-	Active
21,601 K PRESSURE TANK	47179	No	Storage	-	-	Active
DISTRIBUTION PRESSURE STORAGE	13275	No	Storage	-	-	Inactive
TAP 02 PRESSURE STORAGE	13985	No	Storage	-	-	Inactive
GR02-205,337 GALLON GROUND RESERVOIR	44026	No	Storage	-	-	Inactive
TP 02-ION-EXCHANGE TO TREAT WELL 4 & 6	15021	No	Treatment Plant	-	-	Active
TP 01-WELL 3 (ABANDONED)	15020	No	Treatment Plant	-	-	Inactive
TP 03-WELL 5 (ABANDONED)	15022	No	Treatment Plant	-	-	Inactive
TP 04 (INACTIVE)	32450	No	Treatment Plant	-	-	Inactive

1 - 18 of 18

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 02-ION-EXCHANGE TO TREAT WELL 4 & 6	15021	Hypochlorination, Post	Disinfection
TP 02-ION-EXCHANGE TO TREAT WELL 4 & 6	15021	Ion Exchange	Radionuclides removal
TP 02-ION-EXCHANGE TO TREAT WELL 4 & 6	15021	Ion Exchange	Softening (hardness removal)
TP 03-WELL 5 (ABANDONED)	15022	Hypochlorination, Post	Disinfection
TP 04 (INACTIVE)	32450	Hypochlorination, Post	Disinfection

1 - 5 of 5

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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