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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.

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Violations

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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	1157619	Open	02-JUL-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1157613	Returned to Compliance	01-APR-2014	30-JUN-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1157612	Returned to Compliance	01-JAN-2014	31-MAR-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1157611	Returned to Compliance	01-OCT-2013	31-DEC-2013	Yes
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1157609	Returned to Compliance	01-FEB-2009	28-FEB-2009	No
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	8904184	Known	01-JAN-1989	31-JAN-1989	Yes

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
322	1157619	SIE	State Public Notification requested	21-OCT-2025	State	-
318	1157613	SIF	State Public Notification received	11-AUG-2014	State	-
319	1157612	SOX	State Compliance achieved	10-JUL-2014	State	-
319	1157611	SOX	State Compliance achieved	10-JUL-2014	State	-
310	1157609	SOX	State Compliance achieved	19-NOV-2012	State	PWS received approval of General Plan for proposed toolbox option for LT2 on 11/19/2012. BM 4/15/2013
8904601	8904184	SIF	State Public Notification received	17-JAN-1989	State	-

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
OLENTANGY NORTH INTAKE	21610	Yes	Intake	Surface water	Permanent	Active
DWW 6	43108	Yes	Well	Ground water	Permanent	Inactive
DWW 5	43107	Yes	Well	Ground water	Permanent	Inactive
DWW 4	43106	Yes	Well	Ground water	Permanent	Inactive
DWW 3	43105	Yes	Well	Ground water	Permanent	Inactive
DWW 2	43104	Yes	Well	Ground water	Permanent	Inactive
DWW 1	43103	Yes	Well	Ground water	Permanent	Inactive
DELAWARE, CITY WELL 0003	11529	Yes	Well	Ground water	Permanent	Inactive
DELAWARE, CITY WELL 0001	11527	Yes	Well	Ground water	Permanent	Inactive
WL007	42951	Yes	Well	Ground water	Permanent	Active
DELAWARE, CITY WELL TW6A	40030	Yes	Well	Ground water	Permanent	Active
DELAWARE, CITY WELL TW5	40029	Yes	Well	Ground water	Permanent	Active
DELAWARE, CITY WELL TW4	40028	Yes	Well	Ground water	Permanent	Active
DELAWARE, CITY WELL 0002	11528	Yes	Well	Ground water	Permanent	Active
OLENTANGY SOUTH INTAKE	21611	Yes	Intake	Surface water	Permanent	Active
CLEARWELL	40026	No	Clear Well	-	-	Inactive
DELAWARE, CITY DISTRIBUTION	24370	No	Distribution System/Zone	-	-	Active
INTERIM MEMBRANE PLANT	44169	No	Other	-	-	Inactive
SOUTH LOW SERVICE PUMPS	43255	No	Pump Facility	-	-	Active
NORTH LOW SERVICE PUMPS	43256	No	Pump Facility	-	-	Active
HIGH SERVICE PUMPS	43257	No	Pump Facility	-	-	Active
Delaware, City Of P01	85426	No	Sampling Station	-	-	Inactive
HIGHLAND TANK SE	40020	No	Storage	-	-	Active
ST RT 42 TANK WEST	40021	No	Storage	-	-	Active
ST RT 36 TANK EAST	40023	No	Storage	-	-	Active
CLEARWELL	46329	No	Storage	-	-	Active
DELAWARE WTP	2720	No	Treatment Plant	-	-	Active
DELAWARE WTP 2	44137	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
DELAWARE WTP	2720	Coagulation	Inorganics removal
DELAWARE WTP	2720	Flocculation	Inorganics removal
DELAWARE WTP	2720	Sedimentation	Inorganics removal
DELAWARE WTP	2720	Fluoridation	Other
DELAWARE WTP	2720	Permanganate	Disinfection by-products control
DELAWARE WTP	2720	Coagulation	Particulate removal
DELAWARE WTP	2720	Hypochlorination, Pre	Disinfection
DELAWARE WTP	2720	Filtration, Ultrafiltration	Particulate removal
DELAWARE WTP	2720	Filtration, Pressure Sand	Particulate removal
DELAWARE WTP	2720	Reducing Agent, Sodium Bisulfate	De-chlorination
DELAWARE WTP	2720	Filtration, Cartridge	Particulate removal
DELAWARE WTP	2720	pH Adjustment	Other
DELAWARE WTP	2720	Aeration, Packed Tower	Other
DELAWARE WTP	2720	Inhibitor, Polyphosphate	Corrosion control
DELAWARE WTP	2720	Reverse Osmosis	Organics removal
DELAWARE WTP	2720	Reducing Agents	Organics removal
DELAWARE WTP	2720	Innovative	Other
DELAWARE WTP	2720	Gaseous Chlorination, Post	Disinfection
DELAWARE WTP	2720	Gaseous Chlorination, Pre	Disinfection

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