TapScore USA

KNOLL TERRACE PARK EPA Drinking Water Compliance Record

TapScore summarizes EPA Safe Drinking Water Information System records for public water system OR4100174. It does not test household tap water or determine whether water is currently safe to drink.

D

Several health-based records

TapScore compliance-history grade

54 EPA violation records from July 1, 2021 through June 30, 2026

1 classified as health-based

System details

PWSID
OR4100174
Population served
452
Water source
Ground Water
Owner type
Private
State
Oregon
EPA region
10
All historical records
70
Not marked resolved
52

How to read this grade

Grade D means “Several health-based records” under TapScore's published method. It is a comparison of recent EPA compliance records, not an EPA grade, laboratory result, health recommendation, or guarantee of present water quality.

EPA contaminant categories in violation records

EPA categoryClassificationRecords
Consumer Confidence RuleMonitoring/reporting record5
1,2,4-TrichlorobenzeneMonitoring/reporting record2
Benzo(a)pyreneMonitoring/reporting record2
PentachlorophenolMonitoring/reporting record2
Total Polychlorinated Biphenyls (PCB)Monitoring/reporting record2
ETHYLENE DIBROMIDEMonitoring/reporting record2
ChlordaneMonitoring/reporting record2
COLIPHAGEMonitoring/reporting record2
Gross AlphaMonitoring/reporting record2
Revised Total Coliform RuleMonitoring/reporting record1
NitrateMonitoring/reporting record1
LEAD AND COPPER RULE REVISIONSHealth-based record1
AtrazineMonitoring/reporting record1
2,4-DMonitoring/reporting record1
o-DichlorobenzeneMonitoring/reporting record1
HEXACHLOROBENZENEMonitoring/reporting record1
Di(2-ethylhexyl) adipateMonitoring/reporting record1
TolueneMonitoring/reporting record1
1,1,1-TrichloroethaneMonitoring/reporting record1
BenzeneMonitoring/reporting record1

Showing the 20 categories with the most records out of 57 categories in this system's history.

These are compliance records associated with an EPA contaminant code, not current tap-water test results or proof that a substance is presently detected.

Violation history by year

2025
1
2024
1
2023
2
2022
50
2018
1
2011
2
2003
2
2002
1
2001
6
1995
1

Historical counts may include resolved records. For current notices and local sampling results, check the utility's latest Consumer Confidence Report and your state drinking-water agency.

Reported service area

Cities served

CORVALLIS

ZIP codes served

97330

County: Benton