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Updated 2026-10-15
County water report

Clark County Water Quality: 4 Cities Ranked by the Records

Clark County, Washington: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Clark County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems of 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest18.6 ng/L
Perfluorooctanoic acid (PFOA)Detected in 2 systems of 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest11.5 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 4 tested10 ng/L federal MCL (2024) · US EPAHighest6.6 ng/L
Lead (90th percentile)Detected in 4 systems15 µg/L federal action level · US EPAHighest2.2 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 4 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest7.6 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 4 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.3 ng/L
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest5.4 gpg
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 4 testedNo federal or state limit; shown for transparencyHighest3 ng/L
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 4 testedNo federal or state limit; shown for transparencyHighest7.4 ng/L
23 substances tested, none detected in any systemShow

Tested in these 4 systems: BATTLE GROUND WATER DEPT CITY OF, CAMAS MUNICIPAL WATER SEWER SYSTEM, RIDGEFIELD PUBLIC WORKS, VANCOUVER CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • Lithium
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
4 cities

Cities ranked by the records

Showing 4 of 4 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Clark County2 of 4 city reports had a PFAS sample above a 2024 EPA limit
  1. Vancouver18.6 ng/L
  2. Camas12 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Washington
Lead

0of 4 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Washington
Hard water

1city reports hardness · Vancouver, 5.4 gpg

None above 7 gpg, the USGS threshold for hard water. An aesthetic measure with no federal health limit.

Hard water explained
Who supplies the county

Largest water systems

  1. VancouverVANCOUVER CITY OF · WA5391200
    373,047 served
  2. CamasCAMAS MUNICIPAL WATER SEWER SYSTEM · WA5310800
    31,794 served
  3. Battle GroundBATTLE GROUND WATER DEPT CITY OF · WA5304700
    30,237 served
  4. RidgefieldRIDGEFIELD PUBLIC WORKS · WA5372400
    21,225 served
Questions

Frequently asked

How does Clark County tap water compare across cities?

PurityMap ranks 4 cities in Clark County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Battle Ground's main water system: BATTLE GROUND WATER DEPT CITY OF · PWSID WA5304700 · Purity Score 98 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Clark County cities had a PFAS sample above a 2024 EPA limit?

2 of 4 Clark County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Vancouver (PFOS 18.6 ng/L), Camas (PFOS 12 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 2.

Is there lead in Clark County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 4 Clark County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Does Clark County have hard water?

Hardness is published in utility water-quality reports for 1 Clark County city on record; the hardest is Vancouver at 5.4 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

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