Is Yacolt water safe to drink?

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.

How many people does Yacolt serve?

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.

What type of violations does Yacolt have?

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.

Has PFAS been detected in Yacolt water?

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

What water source does Yacolt use?

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

Where does this data come from?

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.

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

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.

How does Yacolt's violation count compare nationally?

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.

States → Washington

Community Water System · PWS WA5399000

Yacolt

Operator location Vancouver, Washington - upper-third violation load (> 74 violations) with 80 EPA violations; groundwater source; 3,034 served (PWS-level, not municipal population).

Compiled by PlainWater · May 15, 2026

3,034
People served (this PWS) Middle third of systems: 80
EPA violations (this PWS) Upper third of systems: 16
Health-based (this PWS) Middle third by health-based share: Untested
UCMR5 (this PWS) No UCMR5 result

Follow published updates (RSS)

Yacolt standing, high SDWIS violation third

80 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 20% is middle-third health share (≤ 23%). Population rank #10,518 of 29,740 among systems serving 500+.

The verdict

Yacolt sits in the upper third of the sitemap cohort by violation count (80), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 3,034 (mid served population (≤ 3,309)). Health-based share is 20% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.

#10,518 of 29,740
Population · /systems: #263 of 766
Population · WA: 80
Total EPA violations on record: 20%
Health-based (MCL / treatment failure)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

Water Safety Score

19/100

Yacolt

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations F

EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)

Monitoring & reporting violations F

Non-health SDWIS violations (monitoring, reporting, and other compliance)

PFAS contamination N/A

Not UCMR5-tested

Highest PFAS compound level detected in UCMR5 testing

System Details

System Type: Community
Owner Type: Local
Connections: 700
County: Clark
School/Daycare: No
MCL Violations: 15
Monitoring Violations: 62
Treatment Tech Violations: 1

Violation History

Contaminant violations recorded by EPA.

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

Violation Count vs. the National Corpus

Yacolt has 80 recorded EPA violations, 68% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 31% carry more. 20% of this system's own violations are health-based (16 of 80), and it ranks #10,518 of 29,740 by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

80 Around the middle fewer violations than 31% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

How many violations vs. how serious, among peer systems

Yacolt plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.

30 public water systems (500+ people served), EPA SDWIS current release.

How to read this

Each dot is one public water system; the highlighted dot is Yacolt. A system to the right has more recorded violations; a system higher up has a larger share of those violations classified health-based rather than monitoring or reporting.

Rare but serious: few violations, but most of them are health-based.
Frequent, mostly paperwork: many violations, but mostly monitoring or reporting, not health-based.
Clean record: below-median on both counts, the tinted corner.

View all 30 systems as a list

City of Ballinger: 372 violations, 85% health-based
Nooksack Valley Water Association: 16 violations, 31% health-based
Montgomery Co RWD 12: 7 violations, 29% health-based
Irvin Water District #6: 11 violations, 27% health-based
Ticonderoga WD: 47 violations, 26% health-based
Pine Valley Plantation: 37 violations, 24% health-based
Yacolt: 80 violations, 20% health-based (this system)
McLouth, City Of: 29 violations, 17% health-based
Kipling Oaks 1: 25 violations, 16% health-based
South Deerfield Water Supply District: 96 violations, 16% health-based
Sunset Ridge Water District: 82 violations, 15% health-based
Orange Water Dept: 136 violations, 14% health-based
Mount Pleasant Water Sys #1: 167 violations, 11% health-based
Lake Gibson Estates: 42 violations, 2% health-based
Benson Culinary Improvement District: 212 violations, 1% health-based
Conemaugh Twp Muni Auth: 567 violations, 1% health-based
Miccosukee Service Plaza: 0 violations, 0% health-based
Brazoria - Fort Bend Counties MUD 3: 0 violations, 0% health-based
Tanglewilde Thompson Place 600: 2 violations, 0% health-based
Center Water Co: 5 violations, 0% health-based
Spring Mills Elem School/Hvs: 9 violations, 0% health-based
Great Bend Industrial Park: 14 violations, 0% health-based
Glen Park Village: 19 violations, 0% health-based
Camp Is-Sho-Da: 22 violations, 0% health-based
Hamilton: 33 violations, 0% health-based
Town of Welaka: 54 violations, 0% health-based
Township of Blairstown Dpw: 61 violations, 0% health-based
McIntosh Water & Fire Pro Authority: 71 violations, 0% health-based
Clarkdale Municipal Water System: 114 violations, 0% health-based
Eureka Water Association: 273 violations, 0% health-based

SDWIS compliance record for Yacolt

80 violations on record for WA5399000; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.

EPA SDWIS · PWS WA5399000 WA primacy agency

Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water

Nationwide peers

80 violations · 3,034 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

Nearest cross-state community systems (500+ served) by total SDWIS violations on record.

4 peers

Cross-state systems near this population served

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Yacolt

Use this system's EPA-reported record as a starting filter, not a final verdict.

See how every tracked system in Washington compares on the same EPA violation measures. Washington systems
Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
Find and compare another public water system by name or PWSID. Search systems

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.