Question 1

Is Yacolt water safe to drink?

Accepted Answer

Yacolt (PWS ID: WA5399000) has 80 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 3,034 people using Groundwater sources.

Question 2

How many people does Yacolt serve?

Accepted Answer

EPA SDWIS reports that Yacolt serves 3,034 people (this public water system's service population, not the municipal population of Vancouver or any other city). It is a Local-owned system using Groundwater water sources with 700 service connections. The operator address is listed in Vancouver, Washington.

Question 3

What type of violations does Yacolt have?

Accepted Answer

Yacolt has 80 total violations: 16 health-based violations (MCL exceedances or treatment failures), 62 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Yacolt water?

Accepted Answer

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

Question 5

What water source does Yacolt use?

Accepted Answer

Yacolt 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 Yacolt sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Yacolt ranks #10,518 of 29,740 by people served, and #263 of 766 in Washington. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Yacolt's violation count compare nationally?

Accepted Answer

Yacolt has 80 recorded EPA SDWIS violations, fewer than 31% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 68% of that cohort has fewer violations than Yacolt. 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)	MCL	15	1997
Pentachlorophenol	MR	4	2002
Di(2-ethylhexyl) adipate	MR	2	2002
Dinoseb	MR	2	2002
Dalapon	MR	2	2002
2,4,5-TP	MR	2	2002
Toxaphene	MR	2	2002
HEXACHLOROBENZENE	MR	2	2002
Chlordane	MR	2	2002
Aldicarb sulfoxide	MR	2	2002
BHC-GAMMA	MR	2	2002
Methoxychlor	MR	2	2002
Aldicarb sulfone	MR	2	2002
Heptachlor	MR	2	2002
LASSO	MR	2	2002
OXAMYL	MR	2	2002
Endrin	MR	2	2002
Simazine	MR	2	2002
Aldicarb	MR	2	2002
Hexachlorocyclopentadiene	MR	2	2002
Picloram	MR	2	2002
Carbofuran	MR	2	2002
Benzo(a)pyrene	MR	2	2002
Atrazine	MR	2	2002
Di(2-ethylhexyl) phthalate	MR	2	2002
Heptachlor epoxide	MR	2	2002
Consumer Confidence Rule	Other	1	2010
Lead and Copper Rule	TT	1	2022
Coliform (TCR)	MR	1	1992
Nitrate	MR	1	1979

Yacolt

Yacolt standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

SDWIS compliance record for Yacolt

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served