Is NICHOLS HILLS required to publish a Consumer Confidence Report?

Yes. NICHOLS HILLS 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 NICHOLS HILLS’s next Consumer Confidence Report due?

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

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.

NICHOLS HILLS, OK · Oklahoma County

NICHOLS HILLS Water System

Consumer Confidence Report status

NICHOLS HILLS 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 NICHOLS HILLS.

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 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)

NICHOLS HILLS is one of 106 community water systems in Oklahoma in the 3,301 to 10,000 people size category, serving 4,020 people from groundwater.

As of August 1, 2026, its federal record holds 53 entries between 1991 and 2025, all of which EPA lists as closed.

Of the 53, 46 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, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and inorganic chemicals.

Violation history

Monitoring and Reporting (DBP)
—
TTHM
January 1, 2025 – December 31, 2025
Archived
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2025 – December 31, 2025
Archived
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2024 – December 31, 2024
Archived
Monitoring, Regular
—
BHC-GAMMA
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Methoxychlor
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
—
2,4-D
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2024 – December 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2024 – December 31, 2024
Archived
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
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
—
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, Regular
—
Toxaphene
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Glyphosate
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Simazine
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Picloram
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
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)
—
Total Haloacetic Acids (HAA5)
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
October 1, 2004 – December 31, 2004
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2004 – December 31, 2004
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2004 – December 31, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 1991 – March 31, 1991
Resolved

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

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2025 – December 31, 2025	Monitoring and Reporting (DBP)	TTHM	—	Archived
January 1, 2025 – December 31, 2025	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Archived
January 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Archived
January 1, 2024 – December 31, 2024	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Methoxychlor	—	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	2,4-D	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	TTHM	—	Archived
January 1, 2024 – December 31, 2024	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2024 – December 31, 2024	Monitoring, Regular	Benzo(a)pyrene	—	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	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
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	Glyphosate	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Simazine	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Picloram	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2023 – December 31, 2023	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	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)	Total Haloacetic Acids (HAA5)	—	Resolved
May 1, 2008 – May 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2004 – December 31, 2004	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
October 1, 2004 – December 31, 2004	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
March 1, 1991 – March 31, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

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

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 Public Notification requested2 linked violations
September 7, 2018State Public Notification received2 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 achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achieved2 linked violations
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 achieved92 linked violations
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
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
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
September 25, 2003State Public Notification requested1 linked violation
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

Common questions

Is NICHOLS HILLS required to publish a Consumer Confidence Report?: Yes. NICHOLS HILLS 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 NICHOLS HILLS’s next Consumer Confidence Report due?: NICHOLS HILLS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does NICHOLS HILLS have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for NICHOLS HILLS.
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

NICHOLS HILLS, CITY OF

405-843-5222

NICHOLS HILLS, OK 73116-6431