Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	WI2650060
PWS Name	WILLIAMS BAY WATERWORKS
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	2601
County Served	Walworth

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	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	2500127	Returned to Compliance	11-SEP-2025	-	No
TT	Public Education	Lead and Copper Rule	Lead and Copper Rule	2500126	Returned to Compliance	01-JUL-2025	-	Yes
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	2500123	Known	01-JAN-2025	30-JUN-2025	No
MR	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	Lead and Copper Rule	2500121	Open	01-JAN-2025	-	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	2500122	Known	01-JAN-2025	30-JUN-2025	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	2100092	Returned to Compliance	01-JUL-2021	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	2100093	Returned to Compliance	01-JUL-2021	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	2000090	Returned to Compliance	01-JUL-2020	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1300085	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	1300087	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1300084	Returned to Compliance	01-OCT-2012	31-OCT-2012	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	1300086	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	1200083	Returned to Compliance	01-JAN-2012	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	0700080	Returned to Compliance	01-APR-2006	-	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	0600077	Returned to Compliance	01-JAN-2006	31-MAR-2006	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	0600078	Returned to Compliance	01-JAN-2006	31-MAR-2006	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	0500076	Known	01-APR-2005	30-JUN-2005	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	0100044	Returned to Compliance	01-OCT-2000	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	0000043	Returned to Compliance	01-JUL-2000	-	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	9700021	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	9700039	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	9700033	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	9700017	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	9700016	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	9700015	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	9700032	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	9700008	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	9700007	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	9700031	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	9700006	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	9700027	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	9700026	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	9700037	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	9700012	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	9700040	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	9700018	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	9600001	Returned to Compliance	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	9700025	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	9700022	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	9700041	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	9700023	Returned to Compliance	01-JAN-1996	31-DEC-1996	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	9500074	Returned to Compliance	01-JAN-1995	31-MAR-1995	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	9500075	Returned to Compliance	01-JAN-1995	31-MAR-1995	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	9405104	Returned to Compliance	01-DEC-1993	31-DEC-1993	No

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
2600121	2500127	SOX	State Compliance achieved	29-DEC-2025	State	-
2600120	2500126	SIF	State Public Notification received	29-DEC-2025	State	-
2600117	2500122	SIE	State Public Notification requested	20-NOV-2025	State	-
2600119	2500123	SIE	State Public Notification requested	20-NOV-2025	State	-
2600115	2500121	SIE	State Public Notification requested	20-NOV-2025	State	-
2200089	2100093	SOX	State Compliance achieved	18-OCT-2021	State	-
2200088	2100092	SOX	State Compliance achieved	18-OCT-2021	State	-
2200087	2000090	SOX	State Compliance achieved	15-FEB-2021	State	-
1300081	1300084	SIA	State Violation/Reminder Notice	10-JUL-2013	State	-
1300081	1300085	SIA	State Violation/Reminder Notice	10-JUL-2013	State	-
1300080	1300087	SFG	State Public Notification issued	01-JUN-2013	State	-
1300080	1300086	SFG	State Public Notification issued	01-JUN-2013	State	-
1400082	1200083	SOX	State Compliance achieved	07-FEB-2012	State	-
0700025	0600078	SFG	State Public Notification issued	07-JUN-2007	State	-
0700025	0600077	SFG	State Public Notification issued	07-JUN-2007	State	-
0700021	0700080	SOX	State Compliance achieved	07-JUN-2007	State	-
0600023	0500076	SFG	State Public Notification issued	01-JUL-2006	State	-
0200007	0100044	SIA	State Violation/Reminder Notice	14-DEC-2001	State	-
0200009	0000043	SIA	State Violation/Reminder Notice	14-DEC-2001	State	-
9800004	9700015	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700016	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700017	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700018	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700021	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700022	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700023	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700025	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700026	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700027	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700031	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700032	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700033	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700037	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700039	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700040	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700041	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700012	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700008	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700007	SOX	State Compliance achieved	06-OCT-1997	State	-
9800004	9700006	SOX	State Compliance achieved	06-OCT-1997	State	-
9700015	9500075	SIA	State Violation/Reminder Notice	24-APR-1997	State	-
9700015	9500074	SIA	State Violation/Reminder Notice	24-APR-1997	State	-
9700011	9600001	SIA	State Violation/Reminder Notice	24-APR-1997	State	-
9408916	9405104	SIF	State Public Notification received	09-MAR-1994	State	-

1 - 44 of 44

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
BH196	1	Yes	Well	Ground water	Permanent	Active
MK404	3	Yes	Well	Ground water	Permanent	Active
BH197	2	Yes	Well	Ground water	Permanent	Active
26500606	26500606	No	Distribution System/Zone	-	-	Active
200	200	No	Other	-	-	Active
200	200T	No	Treatment Plant	-	-	Active

1 - 6 of 6

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
200	200T	Aeration, Slat Tray	Iron removal
200	200T	Coagulation	Softening (hardness removal)
200	200T	Filtration, Rapid Sand	Softening (hardness removal)
200	200T	Flocculation	Softening (hardness removal)
200	200T	Fluoridation	Other
200	200T	Hypochlorination, Post	Disinfection
200	200T	Lime - Soda Ash Addition	Softening (hardness removal)
200	200T	Sedimentation	Softening (hardness removal)
200	200T	pH Adjustment, Pre	Softening (hardness removal)

1 - 9 of 9

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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