Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MA2002000
PWS Name	ACTON WATER SUPPLY DISTRICT
PWS Type	Community water system
Owner Type	Local government
Primary Source	Groundwater under influence of surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	20780
County Served	Middlesex

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
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	108	Returned to Compliance	01-MAR-2024	31-MAR-2024	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	93	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	100	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	101	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	91	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	99	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	89	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	85	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	92	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	86	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	88	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	106	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	1,2-DIBROMO-3-CHLOROPROPANE	107	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	96	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	95	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	98	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	83	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	90	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	97	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	103	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	87	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	94	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	84	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	105	Returned to Compliance	01-OCT-2023	31-DEC-2023	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	76	Returned to Compliance	01-DEC-2014	31-DEC-2014	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	75	Returned to Compliance	01-OCT-2014	31-OCT-2014	Yes
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	74	Returned to Compliance	01-AUG-2014	31-AUG-2014	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	73	Returned to Compliance	01-JUL-2014	31-JUL-2014	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	72	Returned to Compliance	01-NOV-2013	30-NOV-2013	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	71	Returned to Compliance	01-SEP-2012	30-SEP-2012	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	70	Returned to Compliance	01-AUG-2011	31-AUG-2011	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	69	Returned to Compliance	01-JUN-2011	30-JUN-2011	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	68	Returned to Compliance	01-OCT-2010	31-OCT-2010	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	67	Returned to Compliance	01-APR-2010	30-APR-2010	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	66	Returned to Compliance	01-SEP-2009	30-SEP-2009	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	65	Returned to Compliance	01-SEP-2009	30-SEP-2009	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	64	Returned to Compliance	01-MAR-2009	31-MAR-2009	Yes
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	61	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	52	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	51	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	54	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	39	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	46	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	53	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	59	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	43	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	50	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	40	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	44	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	42	Returned to Compliance	01-APR-2007	30-JUN-2007	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
79	108	SOX	State Compliance achieved	28-AUG-2024	State	M&R RTCR MULT 12, RW-M12(MAR 2024)
76	83	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	84	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	85	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	86	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	87	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	88	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	89	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	90	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	91	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	92	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	93	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	94	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	95	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	96	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	97	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	98	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	99	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	100	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	101	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	103	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	105	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	106	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
76	107	SFL	State Administrative/Compliance Order without penalty issued	15-MAY-2024	State	M&R Q4-2023 VOC: MULT 17
67	76	SOX	State Compliance achieved	03-MAR-2015	State	TCR MONTHLY MAX. (MCL) FOR DECEMBER 2014
65	75	SOX	State Compliance achieved	31-DEC-2014	State	TCR MONTHLY MAX. (MCL) FOR OCTOBER 2014
63	74	SOX	State Compliance achieved	08-DEC-2014	State	SWTR M&R AUG 2014 - RTC
61	73	SOX	State Compliance achieved	05-SEP-2014	State	TCR MONTHLY MAX. (MCL) FOR JULY 2014
59	72	SOX	State Compliance achieved	13-DEC-2013	State	TCR MONTHLY MAX. (MCL) FOR NOVEMBER 2013
57	71	SOX	State Compliance achieved	16-OCT-2012	State	TCR MONTHLY MAX. (MCL) FOR SEPTEMBER 2012
52	70	SOX	State Compliance achieved	27-OCT-2011	State	TCR MONTHLY (MAX.) MCL FOR AUGUST 2011
49	69	SOX	State Compliance achieved	14-SEP-2011	State	TCR MONTHLY MAX. (MCL) FOR JUNE 2011
45	68	SOX	State Compliance achieved	16-NOV-2010	State	TCR MONTHLY MAX. (MCL) FOR OCT. 2010
42	67	SOX	State Compliance achieved	14-JUL-2010	State	TCR MONTHLY MAX. MCL FOR APRIL 2010
46	50	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	51	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	52	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	53	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	54	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	55	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	56	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	57	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	59	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	61	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	48	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	47	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	46	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	45	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	44	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9
46	43	SOX	State Compliance achieved	08-FEB-2010	State	Q207-VOC RW-03G, RW-04G, MULT7, RW-M7S (1,4-DIOX); 4/07 PERCHL 02G, 09G, MULT5, MULT7, MULT8, MULT9

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
ASSABET 1 WELL LOW LIFT STATION	5	Yes	Well	Ground water	Emergency	Inactive
CONANT BEDROCK WELL E	78	Yes	Well	Ground water	Permanent	Active
CONANT BEDROCK WELL D	76	Yes	Well	Ground water	Permanent	Active
ASSABET WELL 3	73	Yes	Well	Ground water	Permanent	Active
ASSABET WELL 1A REPLACEMENT WELL	60	Yes	Well	Ground water	Permanent	Active
ASSABET WELL 2 LOW LIFT STATION	6	Yes	Well	Ground water	Permanent	Active
CLAPP GP WELL 302	57	Yes	Well	Ground water	Permanent	Active
CLAPP GP WELL 102	56	Yes	Well	Ground water	Permanent	Active
SCRIBNER GP WELL #4	55	Yes	Well	Ground water	Permanent	Active
SCRIBNER GP WELL #3	54	Yes	Well	Ground water	Permanent	Active
SCRIBNER GP WELL #2	53	Yes	Well	Ground water	Permanent	Active
SCRIBNER GP WELL #1	51	Yes	Well	Ground water	Permanent	Active
ASSABET WELL 2A REPLACEMENT WELL	48	Yes	Well	Ground water	Permanent	Active
CONANT II GP WELL 5	44	Yes	Well	Ground water	Permanent	Active
CONANT II GP WELL 4	42	Yes	Well	Ground water	Permanent	Active
CONANT II GP WELL 3	40	Yes	Well	Ground water	Permanent	Active
CONANT II GP WELL 2	38	Yes	Well	Ground water	Permanent	Active
CONANT II GP WELL 1	36	Yes	Well	Ground water	Permanent	Active
LAWSBROOK LOW LIFT WELL	3	Yes	Well	Ground water	Permanent	Active
CONANT WELL #1	2	Yes	Well	Ground water	Permanent	Active
WHITCOMB WELL	1	Yes	Well	Ground water	Permanent	Active
MARSHALL TWF	9	Yes	Well	Ground water under the influence of surface water	Permanent	Active
CHRISTOFFERSON WELL LOW LIFT STATION	4	Yes	Well	Ground water under the influence of surface water	Permanent	Active
KENNEDY GP WELL #4	29	Yes	Well	Ground water under the influence of surface water	Permanent	Active
KENNEDY GP WELL #3	28	Yes	Well	Ground water under the influence of surface water	Permanent	Active
KENNEDY GP WELL #2	27	Yes	Well	Ground water under the influence of surface water	Permanent	Active
KENNEDY GP WELL #1	10	Yes	Well	Ground water under the influence of surface water	Permanent	Active
SCRIBNER WELL LOW LIFT STATION	8	Yes	Well	Ground water	Emergency	Inactive
CLAPP WELL	7	Yes	Well	Ground water	Emergency	Inactive
CLAPP/WHITCOMB WELL PUMP	11	No	Pump Facility	-	-	Active
WHITCOMB WELL PUMP	12	No	Pump Facility	-	-	Active
CONANT WELL PUMP	13	No	Pump Facility	-	-	Active
LAWSBROOK LOW LIFT WELL PUMP	14	No	Pump Facility	-	-	Active
SCRIBNER WELL LOW LIFT STATION PUMP	15	No	Pump Facility	-	-	Active
CHRISTOFFERSON WELL LOW LIFT STATION	16	No	Pump Facility	-	-	Active
ASSABET 2 WELL LOW LIFT STATION PUMP	18	No	Pump Facility	-	-	Active
ASSABET # 1 WELL LOW LIFT STATION PUMP	26	No	Pump Facility	-	-	Active
CONANT II GPW 1 PUMP STATION	37	No	Pump Facility	-	-	Active
CONANT II GPW 2 PUMP STATION	39	No	Pump Facility	-	-	Active
CONANT II GPW 4 PUMP STATION	41	No	Pump Facility	-	-	Active
CONANT II GPW 3 PUMP STATION	43	No	Pump Facility	-	-	Active
CONANT II GPW 5 PUMP STATION	45	No	Pump Facility	-	-	Active
ASSABET WELL 2A REPLACEMENT WELL PUMP	49	No	Pump Facility	-	-	Active
CONANT II COMBINED PUMP STATION	50	No	Pump Facility	-	-	Active
CLAPP WELL 3 PUMP	58	No	Pump Facility	-	-	Active
CLAPP WELL1 PUMP	59	No	Pump Facility	-	-	Active
ASSABET WELL 1A REPLACEMENT PUMP	61	No	Pump Facility	-	-	Active
ASSABET HIGH HEAD PUMPING STATION	64	No	Pump Facility	-	-	Active
KENNEDY GP WELL 1 PUMP	65	No	Pump Facility	-	-	Active
KENNEDY GP WELL 2 PUMP	66	No	Pump Facility	-	-	Active

1 - 50 of 78

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SCHOOL STREET AERATION PLANT	19	Hypochlorination, Pre	Disinfection
SCHOOL STREET AERATION PLANT	19	Fluoridation	Other
SCHOOL STREET AERATION PLANT	19	Aeration, Packed Tower	Organics removal
ASSABET TREATMENT PLANT	20	Hypochlorination, Post	Disinfection
ASSABET TREATMENT PLANT	20	Fluoridation	Other
ASSABET TREATMENT PLANT	20	Aeration, Packed Tower	Organics removal
KENNEDY AERATION TREATMENT FACILITY	30	Aeration, Packed Tower	Organics removal
KENNEDY AERATION TREATMENT FACILITY	30	Fluoridation	Other
KENNEDY AERATION TREATMENT FACILITY	30	Hypochlorination, Pre	Disinfection
MARSHALL WELLFIELD	33	Fluoridation	Other
CONANT WELL # 1 TREATMENT PLANT	35	Hypochlorination, Post	Disinfection
CONANT WELL # 1 TREATMENT PLANT	35	Fluoridation	Other
CONANT WELL # 1 TREATMENT PLANT	35	pH Adjustment	Corrosion control
CENTRAL ACTON WATER TREATMENT PLANT	46	pH Adjustment	Corrosion control
CENTRAL ACTON WATER TREATMENT PLANT	46	Filtration, Greensand	Inorganics removal
CENTRAL ACTON WATER TREATMENT PLANT	46	Hypochlorination, Post	Disinfection
CENTRAL ACTON WATER TREATMENT PLANT	46	4-Log Treatment of Viruses	Disinfection
CENTRAL ACTON WATER TREATMENT PLANT	46	Hypochlorination, Pre	Disinfection
CENTRAL ACTON WATER TREATMENT PLANT	46	Fluoridation	Other
CENTRAL ACTON WATER TREATMENT PLANT	46	Aeration, Packed Tower	Corrosion control
CLAPP/WHITCOMB TREATMENT PLANT	47	Activated Carbon, Granular	Inorganics removal
CLAPP/WHITCOMB TREATMENT PLANT	47	pH Adjustment, Post	Corrosion control
CLAPP/WHITCOMB TREATMENT PLANT	47	Aeration, Packed Tower	Organics removal
CLAPP/WHITCOMB TREATMENT PLANT	47	Activated Carbon, Granular	Organics removal
CLAPP/WHITCOMB TREATMENT PLANT	47	Hypochlorination, Post	Disinfection
CLAPP/WHITCOMB TREATMENT PLANT	47	Fluoridation	Other
NORTH ACTON WATER TREATMENT PLANT	63	Innovative	Inorganics removal
NORTH ACTON WATER TREATMENT PLANT	63	Innovative	Particulate removal
NORTH ACTON WATER TREATMENT PLANT	63	Aeration, Packed Tower	Organics removal
NORTH ACTON WATER TREATMENT PLANT	63	Fluoridation	Other
NORTH ACTON WATER TREATMENT PLANT	63	Permanganate	Manganese removal
NORTH ACTON WATER TREATMENT PLANT	63	Coagulation	Particulate removal
NORTH ACTON WATER TREATMENT PLANT	63	pH Adjustment, Post	Corrosion control
NORTH ACTON WATER TREATMENT PLANT	63	Hypochlorination, Post	Disinfection
NORTH ACTON WATER TREATMENT PLANT	63	Activated Carbon, Granular	Organics removal
SOUTH ACTON WATER TREATMENT PLANT	72	Aeration, Packed Tower	Organics removal
SOUTH ACTON WATER TREATMENT PLANT	72	pH Adjustment, Pre	Inorganics removal
SOUTH ACTON WATER TREATMENT PLANT	72	Innovative	Inorganics removal
SOUTH ACTON WATER TREATMENT PLANT	72	Rapid Mix	Particulate removal
SOUTH ACTON WATER TREATMENT PLANT	72	Flocculation	Particulate removal
SOUTH ACTON WATER TREATMENT PLANT	72	Filtered	Particulate removal
SOUTH ACTON WATER TREATMENT PLANT	72	Hypochlorination, Pre	Disinfection
SOUTH ACTON WATER TREATMENT PLANT	72	Fluoridation	Other
SOUTH ACTON WATER TREATMENT PLANT	72	Activated Carbon, Granular	Organics removal
NAGOG TANK (EMERGENCY CHLORINE)	75	Hypochlorination, Post	Disinfection

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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

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