NICHOLS HILLS, OK · Oklahoma County

NICHOLS HILLS Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Oklahoma’s official records. Always confirm current status with Oklahoma before making decisions based on this information.

System facts

System ID (PWSID): OK2005501
System type: Community Water System
Population served: 4,020
Service connections: 1,924
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Chlordane
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Endothall
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Glyphosate
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
LASSO
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2024 – December 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2024 – December 31, 2024
Archived
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2024 – December 31, 2024
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 2, 2023 – April 30, 2024
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Endothall
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Endrin
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
June 21, 2017 – September 20, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2016 – June 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2016 – March 31, 2016
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2010 – March 31, 2010
Resolved
Monitoring, Routine (IDSE)
—
TTHM
February 1, 2009 – April 30, 2009
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 2008 – May 31, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
July 1, 2005 – September 30, 2005
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2004 – December 31, 2004
Resolved

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

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2024 – December 31, 2024	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Endothall	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Glyphosate	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	LASSO	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Archived
January 1, 2024 – December 31, 2024	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Methoxychlor	—	Resolved
October 2, 2023 – April 30, 2024	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Endothall	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Endrin	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Methoxychlor	—	Resolved
June 21, 2017 – September 20, 2017	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
April 1, 2016 – June 30, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2016 – March 31, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2010 – March 31, 2010	Monitoring, Regular	Arsenic	—	Resolved
February 1, 2009 – April 30, 2009	Monitoring, Routine (IDSE)	TTHM	—	Resolved
May 1, 2008 – May 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2005 – September 30, 2005	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
October 1, 2004 – December 31, 2004	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved

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

Enforcement actions

November 4, 2025State Compliance achieved29 linked violations
November 4, 2025State Compliance achieved29 linked violations
October 15, 2025State Public Notification requested2 linked violations
October 15, 2025State Violation/Reminder Notice2 linked violations
September 17, 2025State Compliance achieved1 linked violation
September 17, 2025State Compliance achieved1 linked violation
July 15, 2025State Compliance achieved1 linked violation
July 15, 2025State Compliance achieved1 linked violation
July 11, 2025State Violation/Reminder Notice1 linked violation
July 11, 2025State Violation/Reminder Notice1 linked violation
June 30, 2025State Public Notification received31 linked violations
June 30, 2025State Public Notification received2 linked violations
April 10, 2025State Compliance achieved1 linked violation
March 6, 2025State Public Notification requested31 linked violations
March 6, 2025State Violation/Reminder Notice31 linked violations
October 21, 2024State Public Notification requested2 linked violations
October 21, 2024State Violation/Reminder Notice2 linked violations
May 13, 2024State Public Notification received30 linked violations
April 30, 2024State Compliance achieved2 linked violations
February 28, 2024State Violation/Reminder Notice30 linked violations
February 28, 2024State Public Notification requested31 linked violations
January 18, 2024State Violation/Reminder Notice1 linked violation
November 18, 2021State Violation/Reminder Notice2 linked violations
November 18, 2021State Public Notification requested2 linked violations
September 20, 2017State Compliance achieved2 linked violations
August 18, 2017State Public Notification requested2 linked violations
June 30, 2017State Compliance achieved2 linked violations
March 13, 2017State Public Notification requested2 linked violations
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved2 linked violations
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved2 linked violations
August 4, 2016State Compliance achieved2 linked violations
August 4, 2016State Compliance achieved91 linked violations
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achieved2 linked violations
July 25, 2016State Compliance achieved2 linked violations
July 20, 2016State Administrative/Compliance Order with penalty issued2 linked violations
October 9, 2014State Compliance achieved2 linked violations
October 9, 2014State Compliance achieved3 linked violations
February 23, 2011State Compliance achieved2 linked violations
November 12, 2010State Compliance achieved5 linked violations
June 7, 2010State Administrative/Compliance Order with penalty issued5 linked violations
May 13, 2010State Administrative/Compliance Order with penalty issued2 linked violations
June 1, 2008State Compliance achieved25 linked violations
October 9, 2003State Compliance achieved2 linked violations
September 25, 2003State Public Notification requested1 linked violation
September 25, 2003State Violation/Reminder Notice2 linked violations
November 28, 2001State Compliance achieved2 linked violations
September 23, 1991State Consent Decree/Judgementgeneral compliance action — not tied to a specific violation on record
July 29, 1991State Consent Decree/Judgementgeneral compliance action — not tied to a specific violation on record

Contact

NICHOLS HILLS, CITY OF

405-843-5222

NICHOLS HILLS, OK 73116-6431