Question 1

Is Chilmark School water safe to drink?

Accepted Answer

Chilmark School (PWS ID: MA4062008) has 117 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 90 people using Groundwater sources.

Question 2

How many people does Chilmark School serve?

Accepted Answer

EPA SDWIS reports that Chilmark School serves 90 people (this public water system's service population, not the municipal population of Chilmark or any other city). It is a Local-owned system using Groundwater water sources with 0 service connections. The operator address is listed in Chilmark, Massachusetts.

Question 3

What type of violations does Chilmark School have?

Accepted Answer

Chilmark School has 117 total violations: 7 health-based violations (MCL exceedances or treatment failures), 97 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Chilmark School water?

Accepted Answer

No PFAS testing data is available for Chilmark School under the EPA's UCMR5 monitoring program.

Question 5

What water source does Chilmark School use?

Accepted Answer

Chilmark School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.

Question 6

Where does this data come from?

Accepted Answer

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Question 7

How does Chilmark School's violation count compare nationally?

Accepted Answer

Chilmark School has 117 recorded EPA SDWIS violations, fewer than 24% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 76% of that cohort has fewer violations than Chilmark School. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

Contaminant	Category	Count	Latest
Lead and Copper Rule	MR	9	2021
Coliform (TCR)	MR	4	2010
Coliform (TCR)	MCL	4	2010
Revised Total Coliform Rule	TT	3	2020
1,1,1-Trichloroethane	MR	2	2010
o-Dichlorobenzene	MR	2	2010
cis-1,2-Dichloroethylene	MR	2	2010
1,2-Dichloropropane	MR	2	2010
Ethylbenzene	MR	2	2010
Styrene	MR	2	2010
p-Dichlorobenzene	MR	2	2010
DICHLOROMETHANE	MR	2	2010
1,1,2-Trichloroethane	MR	2	2010
1,1-Dichloroethylene	MR	2	2010
Trichloroethylene	MR	2	2010
Carbon tetrachloride	MR	2	2010
Vinyl chloride	MR	2	2010
Public Notice	Other	2	2020
Benzene	MR	2	2010
1,2,4-Trichlorobenzene	MR	2	2010
Toluene	MR	2	2010
CHLOROBENZENE	MR	2	2010
trans-1,2-Dichloroethylene	MR	2	2010
Tetrachloroethylene	MR	2	2010
Xylenes, Total	MR	2	2010
1,2-Dichloroethane	MR	2	2010
Barium	MR	1	2002
Cadmium	MR	1	2002
CYANIDE	MR	1	2002
Fluoride	MR	1	2002

Chilmark School

Chilmark School standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Chilmark School

Nationwide peers

Cross-state systems with comparable violation load