Question 1

Is Dufur, South Basin water safe to drink?

Accepted Answer

Dufur, South Basin (PWS ID: OR4101216) has 132 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 33 people using Groundwater sources.

Question 2

How many people does Dufur, South Basin serve?

Accepted Answer

EPA SDWIS reports that Dufur, South Basin serves 33 people (this public water system's service population, not the municipal population of Dufur or any other city). It is a Local-owned system using Groundwater water sources with 33 service connections. The operator address is listed in Dufur, Oregon.

Question 3

What type of violations does Dufur, South Basin have?

Accepted Answer

Dufur, South Basin has 132 total violations: 5 health-based violations (MCL exceedances or treatment failures), 118 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 Dufur, South Basin water?

Accepted Answer

No PFAS testing data is available for Dufur, South Basin under the EPA's UCMR5 monitoring program.

Question 5

What water source does Dufur, South Basin use?

Accepted Answer

Dufur, South Basin uses Groundwater 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

How does Dufur, South Basin's violation count compare nationally?

Accepted Answer

Dufur, South Basin has 132 recorded EPA SDWIS violations, fewer than 21% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 79% of that cohort has fewer violations than Dufur, South Basin. 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	14	2015
Consumer Confidence Rule	Other	5	2025
Coliform (TCR)	MCL	3	2012
Nitrate	MR	2	2024
Xylenes, Total	MR	2	2008
o-Dichlorobenzene	MR	2	2008
Vinyl chloride	MR	2	2008
1,1-Dichloroethylene	MR	2	2008
1,2-Dichloroethane	MR	2	2008
1,1,1-Trichloroethane	MR	2	2008
Carbon tetrachloride	MR	2	2008
Trichloroethylene	MR	2	2008
CHLOROBENZENE	MR	2	2008
Benzene	MR	2	2008
Ethylbenzene	MR	2	2008
Styrene	MR	2	2008
Dalapon	MR	2	2008
Di(2-ethylhexyl) adipate	MR	2	2008
Di(2-ethylhexyl) phthalate	MR	2	2008
Atrazine	MR	2	2008
LASSO	MR	2	2008
Heptachlor	MR	2	2008
2,4-D	MR	2	2008
HEXACHLOROBENZENE	MR	2	2008
Benzo(a)pyrene	MR	2	2008
Total Polychlorinated Biphenyls (PCB)	MR	2	2008
ETHYLENE DIBROMIDE	MR	2	2008
Revised Total Coliform Rule	MON	2	2023
1,1,2-Trichloroethane	MR	2	2008
Endothall	MR	2	2008

Dufur, South Basin

Dufur, South Basin standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Dufur, South Basin

Nationwide peers

Cross-state systems with comparable violation load