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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	82	Returned to Compliance	02-JUL-2025	-	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	71	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	HEXACHLOROBENZENE	77	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor epoxide	76	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor	75	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	74	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	73	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	72	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Benzo(a)pyrene	78	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	70	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) adipate	69	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Toxaphene	68	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Methoxychlor	67	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	BHC-GAMMA	66	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	65	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	80	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	61	Returned to Compliance	01-OCT-2013	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	60	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	59	Returned to Compliance	01-OCT-2008	31-DEC-2008	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	58	Returned to Compliance	01-FEB-2008	29-FEB-2008	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	34	Returned to Compliance	01-JAN-2006	31-DEC-2006	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	33	Returned to Compliance	01-OCT-2005	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	36	Returned to Compliance	01-APR-2002	30-JUN-2002	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	35	Returned to Compliance	01-APR-2002	30-JUN-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	37	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	57	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	56	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	55	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	54	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	53	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	52	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	51	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	50	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	49	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	48	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	47	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	46	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	45	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	44	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	43	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	42	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	41	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	40	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	39	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	38	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	22	Returned to Compliance	01-DEC-2000	31-DEC-2000	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	1	Returned to Compliance	01-JAN-2000	31-DEC-2000	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	2	Returned to Compliance	01-JAN-2000	31-DEC-2000	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	3	Returned to Compliance	01-JAN-2000	31-DEC-2000	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	4	Returned to Compliance	01-JAN-2000	31-DEC-2000	No

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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
45	82	SOX	State Compliance achieved	24-SEP-2025	State	Initial LSL Inventory submitted to MDE on 10/15/2024 (due 10/16/2024); SL Material Notification sent to water customers on time (due 11/15/2024); Certification of Notification of SL Material and copy of Notice(s) submitted to MDE on 09/24/2025 (due 07/01/2025) .
44	66	SIF	State Public Notification received	03-JUL-2024	State	-
44	67	SIF	State Public Notification received	03-JUL-2024	State	-
44	68	SIF	State Public Notification received	03-JUL-2024	State	-
44	69	SIF	State Public Notification received	03-JUL-2024	State	-
44	70	SIF	State Public Notification received	03-JUL-2024	State	-
44	71	SIF	State Public Notification received	03-JUL-2024	State	-
44	72	SIF	State Public Notification received	03-JUL-2024	State	-
44	73	SIF	State Public Notification received	03-JUL-2024	State	-
44	74	SIF	State Public Notification received	03-JUL-2024	State	-
44	75	SIF	State Public Notification received	03-JUL-2024	State	-
44	76	SIF	State Public Notification received	03-JUL-2024	State	-
44	77	SIF	State Public Notification received	03-JUL-2024	State	-
44	78	SIF	State Public Notification received	03-JUL-2024	State	-
44	80	SIF	State Public Notification received	03-JUL-2024	State	-
44	65	SIF	State Public Notification received	03-JUL-2024	State	-
27	61	SOX	State Compliance achieved	03-APR-2014	State	ENFORCEMENTID :1460926; LATE REPORT
9999900000000000001	23	SOX	State Compliance achieved	10-JAN-2014	ODSWeb	-
40	60	SOX	State Compliance achieved	30-JUN-2009	State	ENFORCEMENTID :0944942; RAA<MCL
37	58	SIF	State Public Notification received	30-JUN-2009	State	ENFORCEMENTID :0847431; CCR
39	59	SOX	State Compliance achieved	05-JAN-2009	State	ENFORCEMENTID :0952882; 3RD QTR VOC NOT COLLECTED AFTER DETECT
25	33	SOX	State Compliance achieved	10-OCT-2007	State	ENFORCEMENTID :0840167;
24	34	SOX	State Compliance achieved	08-MAR-2007	State	ENFORCEMENTID :0737418; SAMPLE COLLECTED 2/15/07: RECVD 3/8/07
7	44	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	45	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	46	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	47	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	48	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	49	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	50	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	51	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	52	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	53	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	54	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	55	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	56	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	57	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	43	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	42	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	41	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	40	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	39	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	38	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
7	37	SOX	State Compliance achieved	11-MAR-2003	State	ENFORCEMENTID :0330301;
23	36	SOX	State Compliance achieved	04-AUG-2002	State	ENFORCEMENTID :0229795; LATE SAMPLING
22	35	SOX	State Compliance achieved	04-AUG-2002	State	ENFORCEMENTID :0229795; LATE SAMPLING
6	1	SOX	State Compliance achieved	16-MAR-2001	State	ENFORCEMENTID :0126369;
6	2	SOX	State Compliance achieved	16-MAR-2001	State	ENFORCEMENTID :0126369;
6	3	SOX	State Compliance achieved	16-MAR-2001	State	ENFORCEMENTID :0126369;
6	4	SOX	State Compliance achieved	16-MAR-2001	State	ENFORCEMENTID :0126369;

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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
0150005 WSSC	31016	Yes	Consecutive Connection	Surface water	Emergency	Active
POTOMAC RIVER	15407	Yes	Intake	Surface water	Permanent	Active
POTOMAC FILTER PLANT	15765	No	Common Headers	-	-	Active
PURCHASE WSSC (POTOMAC PLANT)	15766	No	Common Headers	-	-	Inactive
DISTRIBUTION SYSTEM	8778	No	Distribution System/Zone	-	-	Active
STORAGE TANK	19067	No	Storage	-	-	Active
POTOMAC FILTER PLANT	26235	No	Treatment Plant	-	-	Active

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
POTOMAC FILTER PLANT	26235	Gaseous Chlorination, Post	Disinfection
POTOMAC FILTER PLANT	26235	Gaseous Chlorination, Pre	Disinfection
POTOMAC FILTER PLANT	26235	Inhibitor, Polyphosphate	Corrosion control
POTOMAC FILTER PLANT	26235	pH Adjustment, Post	Corrosion control
POTOMAC FILTER PLANT	26235	Coagulation	Particulate removal
POTOMAC FILTER PLANT	26235	Filtration, Rapid Sand	Particulate removal
POTOMAC FILTER PLANT	26235	Flocculation	Particulate removal
POTOMAC FILTER PLANT	26235	Sedimentation	Particulate removal
POTOMAC FILTER PLANT	26235	Sludge Treatment	Particulate removal
POTOMAC FILTER PLANT	26235	Permanganate	Taste / odor control
POTOMAC FILTER PLANT	26235	Fluoridation	Other

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