Tap WaterIndex

← Oregon

Tap water quality report

Knappa Water Association

EPA monitoring tested this supplier for 61 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

61
contaminants tested
6
detected
1,800
people served
0
health-based violations
Oregon rankingsLead in OregonPFAS in Oregon
Water source
Ground water
Ownership
Private
Counties served
Clatsop

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
11
violations on file
0
still open
ViolationTypeStatusPeriod
MON Monitoring Resolved 2025-12-01 → 2025-12-31
MON Monitoring Resolved 2025-11-01 → 2025-11-30
MON Monitoring Resolved 2023-11-01 → 2023-11-30
MON Monitoring Resolved 2022-07-01 → 2022-07-31
MR Monitoring Resolved 2021-10-01
MON Monitoring Archived 2016-07-01 → 2016-07-31
MR Monitoring Resolved 2000-03-01 → 2000-03-31
MR Monitoring Resolved 1998-10-01 → 1998-10-31
MR Monitoring Resolved 1997-12-01 → 1997-12-31
MR Monitoring Archived 1976-06-01 → 1980-05-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2024
Copper
157.5 µg/L 12%
of the EPA limit 1300 µg/L
worst single sample: 245 µg/L
15/30 SYR4 2012–2018
Nitrate
900 µg/L 9%
of the EPA limit 10000 µg/L
 8/36 SYR4 2012–2019
Lead
5 µg/L 33%
of the EPA limit 15 µg/L
 6/30 SYR4 2012–2018
Gross Alpha, Excl. Radon And U
3.61 pCi/L 24%
of the EPA limit 15 pCi/L
 1/2 SYR4 2017
Total Haloacetic Acids (HAA5)
1 µg/L 1.7%
of the EPA limit 60 µg/L
 1/8 SYR4 2013–2019
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KNAPPA WATER ASSOCIATION
Phone
503-458-6461
Email
[email protected]

Frequently asked questions about Knappa Water Association

Is Knappa Water Association tap water safe to drink?

EPA monitoring detected 6 contaminants in Knappa Water Association's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Knappa Water Association's water?

EPA monitoring detected Lead, Copper, Nitrate, Lead, Gross Alpha, Excl. Radon And U, and others. The full list with the level and data source for each is above.

How many people does Knappa Water Association serve?

Knappa Water Association reports serving 1,800 people in Oregon, per its EPA record.

Has Knappa Water Association had any water quality violations?

The EPA has 11 violations on file for Knappa Water Association, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.