Question 1

Is Fort Thompson Water System water safe to drink?

Accepted Answer

Fort Thompson Water System (PWS ID: 084690440) has 224 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 1,357 people using Surface Water sources.

Question 2

How many people does Fort Thompson Water System serve?

Accepted Answer

EPA SDWIS reports that Fort Thompson Water System serves 1,357 people (this public water system's service population, not the municipal population of Fort Thompson or any other city). It is a Native American-owned system using Surface Water water sources with 302 service connections. The operator address is listed in Fort Thompson, EPA Region 8 — Tribal Water Systems.

Question 3

What type of violations does Fort Thompson Water System have?

Accepted Answer

Fort Thompson Water System has 224 total violations: 39 health-based violations (MCL exceedances or treatment failures), 180 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Fort Thompson Water System water?

Accepted Answer

No PFAS testing data is available for Fort Thompson Water System under the EPA's UCMR5 monitoring program.

Question 5

What water source does Fort Thompson Water System use?

Accepted Answer

Fort Thompson Water System uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

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

Where does Fort Thompson Water System sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Fort Thompson Water System ranks #16,814 of 29,740 by people served, and #33 of 55 in EPA Region 8 — Tribal Water Systems. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Fort Thompson Water System's violation count compare nationally?

Accepted Answer

Fort Thompson Water System has 224 recorded EPA SDWIS violations, fewer than 13% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 87% of that cohort has fewer violations than Fort Thompson Water System. 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
Coliform (TCR)	MR	31	2012
TTHM	MCL	30	2012
TTHM	MR	16	2024
Total Haloacetic Acids (HAA5)	MR	16	2024
Fluoride	MR	6	2022
Total Haloacetic Acids (HAA5)	MCL	5	2004
Lead and Copper Rule	MR	4	2003
Barium	MR	3	2005
Cadmium	MR	3	2005
Chromium	MR	3	2005
Selenium	MR	3	2005
CYANIDE	MR	3	2005
Nitrate	MR	3	1994
Mercury	MR	3	2005
Arsenic	MR	3	2005
1,2,4-Trichlorobenzene	MR	2	2010
cis-1,2-Dichloroethylene	MR	2	2010
DICHLOROMETHANE	MR	2	2010
p-Dichlorobenzene	MR	2	2010
Vinyl chloride	MR	2	2010
1,1-Dichloroethylene	MR	2	2010
trans-1,2-Dichloroethylene	MR	2	2010
1,1,1-Trichloroethane	MR	2	2010
1,2-Dichloropropane	MR	2	2010
Trichloroethylene	MR	2	2010
Tetrachloroethylene	MR	2	2010
CHLOROBENZENE	MR	2	2010
Toluene	MR	2	2010
Styrene	MR	2	2010
Chlorine	MR	2	2012

Fort Thompson Water System

Fort Thompson Water System standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

SDWIS compliance record for Fort Thompson Water System

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served