Public water system record

Chandler

Serves an area of Lincoln County, OK that includes Chandler · 3,142 people served

Federal records show 18 health-based violations and 6 monitoring/reporting issues for Chandler in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

OK1020702
CHANDLER
OK
3,142 served

System profile

Source water Surface water

ZIP 74834

EPA system ID OK1020702

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 18
Resolved: 17
Unresolved: 1
Any acute record: Yes
Monitoring issues, last 10 years: 6

Key facts

Chandler draws water from 1 surface water intake.
Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.13 mg/L, federal limit 0.08 mg/L (1.6 times the limit), 2016.
Most recent formal enforcement: compliance order (no penalty) by EPA, March 2026.
Record on file since 1993, with 117 health-based violations before October 19, 2016.

Check whether Chandler serves your address

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant	Rule family	Start date	Status	Acute
LEAD AND COPPER RULE REVISIONS Treatment technique failure	350	Oct 17, 2024	Active Enforcement action in place	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.096 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Jan 1, 2023	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jan 1, 2023	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Oct 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Oct 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jul 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Jul 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Apr 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Apr 1, 2022	Resolved	No
Interim Enhanced Surface Water Treatment Rule Treatment technique failure	120	Aug 1, 2019	Resolved	Yes
Interim Enhanced Surface Water Treatment Rule Treatment technique failure	120	Jul 1, 2019	Resolved	Yes
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Apr 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.102 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Jan 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.11 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	220	Oct 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jul 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.123 mg/L, federal limit 0.08 mg/L (1.5 times the limit)	220	Apr 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.127 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	220	Jan 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.13 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	220	Oct 1, 2016	Resolved	No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue	Start date	Status
Total Trihalomethanes (TTHMs) Monitoring and reporting	Apr 1, 2025	Resolved
LEAD AND COPPER RULE REVISIONS RPT	Oct 17, 2024	Active Enforcement action in place
Lead and Copper Rule Monitoring and reporting	Jan 1, 2023	Resolved
Haloacetic Acids (HAA5) Monitoring and reporting	Sep 29, 2022	Resolved
Total Trihalomethanes (TTHMs) Monitoring and reporting	Sep 29, 2022	Resolved
Lead and Copper Rule Monitoring and reporting	Jan 1, 2022	Resolved

Full record since 1993

EPA's records for Chandler go back to 1993. Before October 19, 2016 they list 117 health-based violations (89 resolved, 28 archived by EPA without a recorded fix) and 29 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
1990s	51	7
2000s	36	22
2010 to October 18, 2016	30	0
October 19, 2016 to 2019	8	0
2020s	9	6

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.

Show all 117 health-based violations before October 19, 2016

Contaminant	Start date	Status
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.13 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	Oct 1, 2016	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.117 mg/L, federal limit 0.08 mg/L (1.5 times the limit)	Jul 1, 2016	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.148 mg/L, federal limit 0.08 mg/L (1.9 times the limit)	Apr 1, 2016	Resolved
Surface Water Treatment Rule Treatment technique failure	Apr 1, 2016	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.12 mg/L, federal limit 0.08 mg/L (1.5 times the limit)	Jan 1, 2016	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.124 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	Oct 1, 2015	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.106 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	Jul 1, 2015	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Apr 1, 2015	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.129 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	Jan 1, 2015	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Oct 1, 2014	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.133 mg/L, federal limit 0.08 mg/L (1.7 times the limit)	Jul 1, 2014	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.13 mg/L, federal limit 0.08 mg/L (1.6 times the limit)	Apr 1, 2014	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Jan 1, 2014	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.123 mg/L, federal limit 0.08 mg/L (1.5 times the limit)	Oct 1, 2013	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.113 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	Oct 1, 2012	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Jul 1, 2012	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Apr 1, 2012	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Jan 1, 2012	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Oct 1, 2011	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Jul 1, 2011	Resolved
Total Coliform Contaminant limit exceeded	Jun 1, 2011	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Apr 1, 2011	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Jan 1, 2011	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Oct 1, 2010	Resolved
Interim Enhanced Surface Water Treatment Rule (acute) Treatment technique failure	Aug 1, 2010	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Jul 1, 2010	Resolved
Interim Enhanced Surface Water Treatment Rule (acute) Treatment technique failure	Jul 1, 2010	Resolved
Interim Enhanced Surface Water Treatment Rule (acute) Treatment technique failure	May 1, 2010	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Apr 1, 2010	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Jan 1, 2010	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Oct 1, 2009	Resolved
Interim Enhanced Surface Water Treatment Rule (acute) Treatment technique failure	Aug 1, 2009	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Jul 1, 2009	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)	Apr 1, 2009	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.096 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Jan 1, 2009	Resolved
CARBON, TOTAL Treatment technique failure	Oct 1, 2008	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.106 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	Oct 1, 2008	Resolved
Interim Enhanced Surface Water Treatment Rule (acute) Treatment technique failure	Aug 1, 2008	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	Jul 1, 2008	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	Apr 1, 2008	Resolved
CARBON, TOTAL Treatment technique failure	Jul 1, 2007	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.108 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	Apr 1, 2007	Resolved
CARBON, TOTAL Treatment technique failure	Apr 1, 2007	Resolved
CARBON, TOTAL Treatment technique failure	Jan 1, 2007	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.145 mg/L, federal limit 0.08 mg/L (1.8 times the limit)	Jan 1, 2007	Resolved
CARBON, TOTAL Treatment technique failure	Oct 1, 2006	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.174 mg/L, federal limit 0.08 mg/L (2.2 times the limit)	Oct 1, 2006	Resolved
CARBON, TOTAL Treatment technique failure	Jul 1, 2006	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.181 mg/L, federal limit 0.08 mg/L (2.3 times the limit)	Jul 1, 2006	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.185 mg/L, federal limit 0.08 mg/L (2.3 times the limit)	Apr 1, 2006	Resolved

67 older violations are not listed here. EPA ECHO has the complete list.

Enforcement actions

Oklahoma regulators and EPA took 68 formal enforcement actions against Chandler between 1995 and 2026, filed as 69 records in EPA's data. The most recent was a compliance order (no penalty) in March 2026.

Date	By	Action	Violations covered
Mar 17, 2026	EPA	Compliance order (no penalty)	2 violations (1 health-based): LEAD AND COPPER RULE REVISIONS
Apr 12, 2023	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Feb 3, 2023	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Nov 15, 2022	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Jun 29, 2022	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Oct 7, 2019	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Interim Enhanced Surface Water Treatment Rule
Dec 20, 2016	Oklahoma	Compliance order with a penalty	19 violations (19 health-based): Total Trihalomethanes (TTHMs)
Aug 3, 2016	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Surface Water Treatment Rule
Mar 9, 2016	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Dec 2, 2015	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Sep 9, 2015	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Jun 9, 2015	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Mar 11, 2015	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Nov 12, 2014	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Jul 31, 2014	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
May 5, 2014	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Jan 23, 2013	Oklahoma	Compliance order with a penalty	49 violations (49 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL, Interim Enhanced Surface Water Treatment Rule
Jan 10, 2011	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule
Sep 13, 2010	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Interim Enhanced Surface Water Treatment Rule
Jul 8, 2010	Oklahoma	Compliance order with a penalty	40 violations (37 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL
Oct 9, 2009	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule
Mar 30, 2009	Oklahoma	Compliance order with a penalty	2 violations: CARBON, TOTAL
Oct 22, 2008	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule
Aug 29, 2008	Oklahoma	Compliance order with a penalty	6 violations (1 health-based): 2,4-D, Glyphosate, Diquat, Atrazine, Total Trihalomethanes (TTHMs)
Jun 25, 2008	Oklahoma	Compliance order with a penalty	1 violation: Arsenic
Nov 6, 2007	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL
May 16, 2007	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs)
Feb 15, 2007	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs)
Nov 9, 2006	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs)
Oct 5, 2006	Oklahoma	Compliance order with a penalty	3 violations (3 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL, Haloacetic Acids (HAA5)
Sep 12, 2006	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
Aug 31, 2006	Oklahoma	Compliance order (no penalty)	46 violations (45 health-based): Haloacetic Acids (HAA5), CARBON, TOTAL, Total Trihalomethanes (TTHMs)
Apr 10, 2006	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Jan 4, 2006	Oklahoma	Compliance order with a penalty	5 violations (4 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL
Nov 14, 2005	Oklahoma	Compliance order with a penalty	2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Mar 21, 2005	Oklahoma	Compliance order with a penalty	3 violations (3 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL
Dec 29, 2004	Oklahoma	Compliance order with a penalty	1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Feb 11, 2003	Oklahoma	Compliance order with a penalty	1 violation: Nitrate
Feb 16, 1999	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Jan 19, 1999	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Dec 15, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Oct 5, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Aug 17, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Jul 16, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
May 19, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Apr 16, 1998	Oklahoma	Compliance order (no penalty)	2 violations (2 health-based): Surface Water Treatment Rule
Mar 9, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Jan 20, 1998	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Dec 16, 1997	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule
Dec 1, 1997	Oklahoma	Compliance order (no penalty)	1 violation (1 health-based): Surface Water Treatment Rule

18 older actions are not listed here. EPA ECHO has the complete list.

What the violations mean

Total Trihalomethanes (TTHMs)

15 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Interim Enhanced Surface Water Treatment Rule

2 incidents

The system did not meet a filtration or treatment requirement for surface water

Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Chandler draws water from 1 surface water intake. 4 other community water systems and 1 smaller public system such as schools, businesses or campgrounds buy water from Chandler.

Community systems that buy water from it

Annual water quality report

Chandler must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Oklahoma.

Certified drinking water labs by state EPA guidance for private wells