Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IL0990550
PWS Name	MENDOTA
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	6926
County Served	LaSalle

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
RPT	Notification, Known or Potential LSL	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	7143834	Returned to Compliance	02-JUL-2025	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	7143835	Open	01-JUL-2025	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7143836	Returned to Compliance	01-JUL-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	7143821	Returned to Compliance	01-JAN-2021	31-MAR-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	7143818	Returned to Compliance	01-OCT-2020	31-DEC-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	7143817	Returned to Compliance	01-JUL-2020	30-SEP-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143813	Returned to Compliance	01-JAN-2008	31-MAR-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143811	Returned to Compliance	01-OCT-2007	31-DEC-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143810	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143809	Returned to Compliance	01-APR-2007	30-JUN-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143808	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143807	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143707	Returned to Compliance	01-JUL-2006	30-SEP-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7143606	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	7142605	Returned to Compliance	19-AUG-2005	-	No
Other	Public Notification Violation without NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	7142705	Returned to Compliance	19-AUG-2005	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7142405	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7142005	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)	7141705	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)	7141405	Returned to Compliance	01-JUL-2004	30-SEP-2004	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	7141304	Known	01-JUN-2004	30-JUN-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7141204	Returned to Compliance	01-APR-2004	30-JUN-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7141004	Returned to Compliance	01-JAN-2004	31-MAR-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7140804	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)	7140604	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)	7140403	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)	7140203	Returned to Compliance	01-JAN-2003	31-MAR-2003	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	7140003	Returned to Compliance	01-OCT-2002	31-DEC-2002	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	5261201	Returned to Compliance	03-NOV-2000	30-SEP-2002	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	257485	Returned to Compliance	23-AUG-1985	22-AUG-1989	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	7139880	Known	30-JUN-1977	29-JUN-1981	No

1 - 31 of 31

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
1013870	7143836	SOX	State Compliance achieved	15-OCT-2025	State	-
1013867	7143835	SIE	State Public Notification requested	29-JUL-2025	State	-
1013865	7143834	SIE	State Public Notification requested	03-JUL-2025	State	-
1013842	7143821	SIF	State Public Notification received	12-JUL-2021	State	-
1013841	7143818	SOX	State Compliance achieved	29-JUN-2021	State	-
1013841	7143817	SOX	State Compliance achieved	29-JUN-2021	State	-
1013826	7143808	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143606	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143707	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143813	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143811	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143810	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143809	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1013826	7143807	SOX	State Compliance achieved	29-MAY-2008	State	Installed treament for rads 2007Q4. Achieved compliance 2008Q2, combined radium RAA < or = MCL. pbc
1012505	7142705	SOX	State Compliance achieved	20-SEP-2005	State	Supply issued PN 9/14/05 (LATE), IEPA rcvd copy 9/20/05.
1012505	7142605	SOX	State Compliance achieved	20-SEP-2005	State	Supply issued PN 9/14/05 (LATE), IEPA rcvd copy 9/20/05.
1012605	7142405	SIF	State Public Notification received	20-SEP-2005	State	-
1012105	7142005	SIF	State Public Notification received	15-JUN-2005	State	-
1012005	7141405	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7141204	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7141004	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7140804	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7140604	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7141705	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7140203	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7140003	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	5261201	SOX	State Compliance achieved	18-APR-2005	State	-
1012005	7140403	SOX	State Compliance achieved	18-APR-2005	State	-
1010104	7141304	SIF	State Public Notification received	30-SEP-2004	State	-
1006485	257485	SOX	State Compliance achieved	13-NOV-1985	State	-

1 - 30 of 30

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL 4 (11489) (EMERGENCY)	19401	Yes	Well	Ground water	Emergency	Active
WELL 9 (01989)	40435	Yes	Well	Ground water	Permanent	Active
WELL 6 (11490)	19402	Yes	Well	Ground water	Permanent	Active
WELL 3 (11487)	19399	Yes	Well	Ground water	Permanent	Active
WELL 5 (11488) ABANDONED	19400	Yes	Well	Ground water	Other	Inactive
WELL 8 (00857) ABANDONED	18663	Yes	Well	Ground water	Other	Inactive
WELL 7 (00606) ABANDONED	18417	Yes	Well	Ground water	Other	Inactive
MENDOTA	24270	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	45405	No	Distribution System/Zone	-	-	Active
CHILDCARE FACILITY LEAD SAMPLING	45406	No	Distribution System/Zone	-	-	Active
NORTHWEST BOOSTER STATION	35156	No	Pump Facility	-	-	Active
ELEVATED TANK BOOSTER PUMP	35155	No	Pump Facility	-	-	Inactive
GENERIC FINISHED SAMPLING STATION	27929	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	30351	No	Sampling Station	-	-	Active
WATER QUALITY SAMPLING	45506	No	Sampling Station	-	-	Active
WATER QUALITY SAMPLING	45507	No	Sampling Station	-	-	Active
WATER QUALITY SAMPLING	45508	No	Sampling Station	-	-	Active
TP 01 GROUND STORAGE	12903	No	Storage	-	-	Active
TP 02 GROUND STORAGE	12904	No	Storage	-	-	Active
TP 03 GROUND STORAGE	12905	No	Storage	-	-	Active
ELEV1 - 0.5 MG ELEVATED TANK	44152	No	Storage	-	-	Active
ELEV2 - 0.75 MG ELEVATED TANK	44153	No	Storage	-	-	Active
DISTRIBUTION ELEVATED STORAGE	11391	No	Storage	-	-	Inactive
DISTRIBUTION GROUND STORAGE	12291	No	Storage	-	-	Inactive
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	No	Treatment Plant	-	-	Active
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	No	Treatment Plant	-	-	Active
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	No	Treatment Plant	-	-	Active
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	No	Treatment Plant	-	-	Active
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	No	Treatment Plant	-	-	Active

1 - 29 of 29

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	Filtration, Pressure Sand	Radionuclides removal
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	Inhibitor, Orthophosphate	Corrosion control
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	Innovative	Radionuclides removal
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	Gaseous Chlorination, Post	Disinfection
TP 01-WELL #3 TREATED W/ HMO FILTER	16278	Gaseous Chlorination, Pre	Iron removal
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Inhibitor, Orthophosphate	Corrosion control
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Innovative	Radionuclides removal
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Filtration, Rapid Sand	Radionuclides removal
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Gaseous Chlorination, Post	Disinfection
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Aeration, Slat Tray	Iron removal
TP 02-WELL #4 HMO FILTER (EMERGENCY)	16279	Gaseous Chlorination, Pre	Iron removal
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Aeration, Slat Tray	Taste / odor control
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Gaseous Chlorination, Pre	Taste / odor control
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Innovative	Radionuclides removal
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Inhibitor, Polyphosphate	Corrosion control
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Gaseous Chlorination, Post	Disinfection
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Filtration, Pressure Sand	Radionuclides removal
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Gaseous Chlorination, Pre	Disinfection
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Filtration, Pressure Sand	Iron removal
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Aeration, Slat Tray	Iron removal
TP 03-WELL 6 TREATED W/ HMO FILTERS	16280	Gaseous Chlorination, Pre	Iron removal
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	Coagulation	Inorganics removal
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	Gaseous Chlorination, Pre	Disinfection
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	Aeration, Slat Tray	Iron removal
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	Gaseous Chlorination, Pre	Iron removal
TP 04-WELLS 7 AND 8 (EMERGENCY)	16281	Filtration, Rapid Sand	Iron removal
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	Aeration, Packed Tower	Iron removal
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	Innovative	Radionuclides removal
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	Filtration, Greensand	Iron removal
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	Gaseous Chlorination, Pre	Disinfection
TP05 - WELL #9 TREATED W/ IRON FILTER	40875	Inhibitor, Polyphosphate	Corrosion control

1 - 31 of 31

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.

Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Nav Menu

Your Drinking Water Query results from SDWIS Fed Reporting Services

Note

PWS Violation

Violations

Column Actions

Enforcement Actions

Enforcement Actions

Column Actions

PWS Facilities

All Facilities

Column Actions

PWS Treatment Processes

Treatment Processes

Column Actions