ONTARIO CITY

Ohio — Community Water System — PWSID: OH7003512

System Information

PWSID	OH7003512
System Name	ONTARIO CITY
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	05
Serves School	No
Wholesaler	No
First Reported	Jan 30, 1981
Last Reported	Nov 17, 2025

Location & Contact

State	Ohio
City	ONTARIO
ZIP Code	44906
Address	555 STUMBO RD
Organization	GONGWER, ADAM
Phone	567-437-5830

Population & Service

Population Served	6,656
Service Connections	2,684

Drinking Water Violations (67)

This water system has 67 violations recorded in the EPA SDWIS database.

Begin Date	End Date	Contaminant	Category	Health-Based	Major	Measured	Federal MCL	State MCL	Status	Return to Compliance	Rule
Dec 13, 2018	—	Consumer Confidence Rule	Other	No	No	—	—	—	Unaddressed	—	Consumer Confidence Rule
Jul 1, 2002	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Jul 9, 2007	Consumer Confidence Rule
Jul 1, 2002	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Jul 9, 2007	Consumer Confidence Rule
Jul 1, 1999	Dec 31, 1999	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1999	Nitrate Rule
Jul 1, 1999	Dec 31, 1999	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1999	Nitrate Rule
Jul 1, 1999	Dec 31, 1999	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1999	Nitrate Rule
Jul 1, 1999	Dec 31, 1999	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1999	Nitrate Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1995	Jun 30, 1995	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Selenium	MR	No	Yes	—	0.05 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Selenium	MR	No	Yes	—	0.05 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Selenium	MR	No	Yes	—	0.05 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1995	Radionuclides and Revised Rad Rule
Jan 1, 1995	Jun 30, 1995	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1995	Radionuclides and Revised Rad Rule
Jan 1, 1995	Jun 30, 1995	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1995	Radionuclides and Revised Rad Rule
Jan 1, 1995	Jun 30, 1995	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1995	Radionuclides and Revised Rad Rule
Jan 1, 1995	Jun 30, 1995	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 1995	Arsenic Rule
Jan 1, 1995	Jun 30, 1995	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 1995	Arsenic Rule
Jan 1, 1995	Jun 30, 1995	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 1995	Arsenic Rule
Jan 1, 1995	Jun 30, 1995	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 1995	Arsenic Rule
Jan 1, 1995	Jun 30, 1995	Asbestos	MR	No	Yes	—	7 MFL	—	Resolved	Jun 30, 1995	Inorganic Chemicals
Jan 1, 1995	Jun 30, 1995	Asbestos	MR	No	Yes	—	7 MFL	—	Resolved	Jun 30, 1995	Inorganic Chemicals

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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