OR4100174 · Oregon
KNOLL TERRACE PARK
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 54
- EPA health-based flag
- 1
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 51
Counties listed by EPA · Benton County, Oregon
Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.
Violations and what followed
Among 54 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 1,095 days. The interval uses the reporting periods and dates on file.
Other or unclassified · Resolved
Consumer Confidence Report Complete Failure to ReportViolation 1771817 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2025 · period end July 18, 2025 · first reported December 23, 2025 · EPA return-to-compliance field July 18, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 641 July 18, 2025 Resolving State Compliance achieved EPA health-based flag · Resolved
LSL InventoryViolation 1771816 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule RevisionsNoncompliance period start October 17, 2024 · period end February 28, 2025 · first reported March 20, 2025 · EPA return-to-compliance field February 28, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 639 February 28, 2025 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771815 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2024 · period end December 31, 2024 · first reported March 20, 2025 · EPA return-to-compliance field December 31, 2024
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 637 March 7, 2025 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Complete Failure to ReportViolation 1771814 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2023 · period end August 21, 2023 · first reported November 28, 2023 · EPA return-to-compliance field August 21, 2023
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 635 August 21, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771868 · Chlordane · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 661 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771867 · ETHYLENE DIBROMIDE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 652 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771866 · 1,2-DIBROMO-3-CHLOROPROPANE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 648 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771865 · Total Polychlorinated Biphenyls (PCB) · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 672 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771864 · Pentachlorophenol · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 645 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771863 · Benzo(a)pyrene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 658 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771862 · HEXACHLOROBENZENE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 644 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771861 · 2,4,5-TP · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 684 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771860 · 2,4-D · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 650 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771859 · Heptachlor epoxide · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 646 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771858 · Heptachlor · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 666 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771857 · LASSO · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 682 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771856 · Atrazine · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 645 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771855 · Carbofuran · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 669 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771854 · Hexachlorocyclopentadiene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 678 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771853 · Dinoseb · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 651 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771852 · Picloram · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 681 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771851 · Di(2-ethylhexyl) phthalate · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 649 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771850 · Simazine · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 671 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771849 · OXAMYL · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 665 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771848 · Di(2-ethylhexyl) adipate · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 683 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771847 · Glyphosate · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 677 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771846 · Endothall · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 652 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771845 · Diquat · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 664 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771844 · Dalapon · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 674 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771843 · Toxaphene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 662 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771842 · Methoxychlor · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 657 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771841 · BHC-GAMMA · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 685 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771840 · Endrin · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 642 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771839 · Styrene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 670 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771838 · Ethylbenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 643 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771837 · Toluene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 668 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771836 · Benzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 660 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771835 · CHLOROBENZENE · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 673 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771834 · Tetrachloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 659 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771833 · 1,1,2-Trichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 684 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771832 · Trichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 679 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771831 · 1,2-Dichloropropane · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 647 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771830 · Carbon tetrachloride · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 654 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771829 · 1,1,1-Trichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 667 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771828 · 1,2-Dichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 675 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771827 · trans-1,2-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 680 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771826 · 1,1-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 655 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771825 · Vinyl chloride · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 659 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771824 · p-Dichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 653 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771823 · o-Dichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 676 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771822 · DICHLOROMETHANE · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 678 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771821 · Xylenes, Total · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 646 June 19, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771820 · cis-1,2-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 656 June 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1771819 · 1,2,4-Trichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 663 June 17, 2026 Resolving State Compliance achieved
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility