Public Water Partners

CORVALLIS, OR · Benton County

KNOLL TERRACE PARK Water System

Consumer Confidence Report status

KNOLL TERRACE PARK must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for KNOLL TERRACE PARK.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Oregon’s official records. Always confirm current status with Oregon before making decisions based on this information.

System facts

System ID (PWSID)
OR4100174
System type
Community Water System
Population served
452
Service connections
210
Ownership
privately owned
Water source
groundwater (wells)

KNOLL TERRACE PARK is one of 1,168 community water systems in Oregon in the 500 or fewer people size category, serving 452 people from groundwater.

As of August 1, 2026, its federal record holds 77 entries between 1976 and 2025, all of which EPA lists as closed.

Of the 77, 70 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, volatile organic chemicals, and the Consumer Confidence Rule.

Violation history

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2025 – July 18, 2025

    Resolved

  • LSL Inventory

    Health-based

    LEAD AND COPPER RULE REVISIONS

    October 17, 2024 – February 28, 2025

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2024 – December 31, 2024

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2023 – August 21, 2023

    Resolved

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Diquat

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Endothall

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Glyphosate

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    LASSO

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    2,4-D

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    ETHYLENE DIBROMIDE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Xylenes, Total

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Benzene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Toluene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Styrene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Routine (RTCR)

    —

    Revised Total Coliform Rule

    May 1, 2018 – May 31, 2018

    Resolved

  • Failure to Conduct Assessment Monitoring

    —

    COLIPHAGE

    January 1, 2012 – December 31, 2012

    Resolved

  • Failure to Conduct Assessment Monitoring

    —

    COLIPHAGE

    January 1, 2012 – December 31, 2012

    Resolved

  • Monitoring and Reporting (DBP)

    —

    TTHM

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring and Reporting (DBP)

    —

    Total Haloacetic Acids (HAA5)

    January 1, 2005 – December 31, 2007

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    October 19, 2003 – November 8, 2006

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2003 – November 8, 2006

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    October 19, 2002 – November 8, 2006

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2002 – November 8, 2006

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Xylenes, Total

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    January 1, 1996 – December 31, 1999

    Resolved

  • Monitoring, Regular

    —

    Combined Radium (-226 and -228)

    June 1, 1976 – May 31, 1980

    Archived

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    June 1, 1976 – May 31, 1980

    Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is KNOLL TERRACE PARK required to publish a Consumer Confidence Report?

Yes. KNOLL TERRACE PARK is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is KNOLL TERRACE PARK’s next Consumer Confidence Report due?

KNOLL TERRACE PARK’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does KNOLL TERRACE PARK have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for KNOLL TERRACE PARK.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

KNOLL TERRACE PARK

541-752-2225

CORVALLIS, OR 97330