Question 1

Is Oak Park water safe to drink?

Accepted Answer

Oak Park (PWS ID: WA5362675) has 61 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 695 people using Groundwater sources.

Question 2

How many people does Oak Park serve?

Accepted Answer

EPA SDWIS reports that Oak Park serves 695 people (this public water system's service population, not the municipal population of Shelton or any other city). It is a Private-owned system using Groundwater water sources with 227 service connections. The operator address is listed in Shelton, Washington.

Question 3

What type of violations does Oak Park have?

Accepted Answer

Oak Park has 61 total violations: 2 health-based violations (MCL exceedances or treatment failures), 55 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Oak Park water?

Accepted Answer

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

Question 5

What water source does Oak Park use?

Accepted Answer

Oak Park 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

Where does Oak Park sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Oak Park ranks #24,548 of 29,740 by people served, and #628 of 766 in Washington. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Oak Park's violation count compare nationally?

Accepted Answer

Oak Park has 61 recorded EPA SDWIS violations, fewer than 38% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 62% of that cohort has fewer violations than Oak Park. 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
Nitrate	MR	3	2022
o-Dichlorobenzene	MR	2	2011
1,1-Dichloroethylene	MR	2	2011
trans-1,2-Dichloroethylene	MR	2	2011
1,2-Dichloroethane	MR	2	2011
1,1,1-Trichloroethane	MR	2	2011
1,2-Dichloropropane	MR	2	2011
Trichloroethylene	MR	2	2011
Benzene	MR	2	2011
Toluene	MR	2	2011
Ethylbenzene	MR	2	2011
1,2,4-Trichlorobenzene	MR	2	2011
DICHLOROMETHANE	MR	2	2011
p-Dichlorobenzene	MR	2	2011
Carbon tetrachloride	MR	2	2011
1,1,2-Trichloroethane	MR	2	2011
CHLOROBENZENE	MR	2	2011
Styrene	MR	2	2011
Coliform (TCR)	MR	2	1992
Coliform (TCR)	MCL	2	1995
Vinyl chloride	MR	2	2011
cis-1,2-Dichloroethylene	MR	2	2011
Tetrachloroethylene	MR	2	2011
Consumer Confidence Rule	Other	1	1999
Revised Total Coliform Rule	MON	1	2018
Cadmium	MR	1	1979
Mercury	MR	1	1979
Barium	MR	1	1979
Selenium	MR	1	1979
Chromium	MR	1	1979

Oak Park

Oak Park standing, mid SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Oak Park

Nationwide peers

Cross-state systems near this violation count

Cross-state systems with smaller service footprints