Johnston County, Oklahoma — public water systems
At a glance
13 active public water systems are filed under Johnston County, Oklahoma in EPA's SDWIS records, together reporting 10,296 people served. The largest is Tishomingo Municipal Authority, which reports serving 3,000 people. 10 are community water systems serving people where they live; the other 3 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
13
Population served
10.3K
Community systems
10
Groundwater share
84.6%
How does Johnston County compare with other Oklahoma counties?
Johnston County has the 32nd-most active public water systems among the 92 counties listed for active Oklahoma systems in EPA records; among the 78 with 3 or more systems, the median has 11. Its systems report 10,296 people served in total, the 52nd-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 792 people, well below the Oklahoma average of 2,907. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Johnston County's drinking water come from?
By primary water source, Johnston County's active systems draw on groundwater (10, 77%), surface water (2, 15%) and purchased groundwater (1, 7.7%). Overall, 85% rely mainly on groundwater (including purchased groundwater) and 15% on surface water, compared with 62% and 38% across Oklahoma. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Tishomingo Municipal Authority, draws primarily on surface water.
What kinds of water systems operate in Johnston County?
Johnston County's active systems break down as 10 community systems (77%), 2 non-transient non-community systems (15%) and 1 transient non-community systems (7.7%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as local government (69%), private (23%) and state government (7.7%).
Water systems in Johnston County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Tishomingo Municipal Authority | Johnston | 3,000 | Community | Surface water |
| 2 | Johnston Co Rwd #3 | Johnston | 2,783 | Community | Groundwater |
| 3 | Murray State College | Johnston | 1,150 | Community | Surface water |
| 4 | Johnston Co Rws& Swmd #4 | Johnston | 600 | Community | Groundwater |
| 5 | Mannsville Public Works Authority | Johnston | 587 | Community | Groundwater |
| 6 | Ravia | Johnston | 459 | Community | Groundwater |
| 7 | Sundowner Trailer | Johnston | 450 | Non-transient non-community | Groundwater |
| 8 | Wapanucka | Johnston | 420 | Community | Groundwater |
| 9 | Milburn Public Works Authority | Johnston | 317 | Community | Purchased groundwater |
| 10 | Mill Creek | Johnston | 310 | Community | Groundwater |
| 11 | Bromide | Johnston | 163 | Community | Groundwater |
| 12 | Us Silica | Johnston | 31 | Non-transient non-community | Groundwater |
| 13 | Camp Simpson Bsa | Johnston | 26 | Transient non-community | Groundwater |
Johnston County water systems: frequently asked questions
How many public water systems are in Johnston County, Oklahoma?
EPA's SDWIS records file 13 active public water systems under Johnston County, Oklahoma: 10 community systems (77%), 2 non-transient non-community systems (15%) and 1 transient non-community systems (7.7%).
Who supplies drinking water in Johnston County, OK?
The largest community water systems filed under Johnston County are Tishomingo Municipal Authority (3,000 people served), Johnston Co Rwd #3 (2,783 people served) and Murray State College (1,150 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Johnston County's drinking water come from groundwater or surface water?
Of the 13 active public water systems in Johnston County, 85% draw mainly on groundwater and 15% on surface water, counting purchased supplies. The largest system, Tishomingo Municipal Authority, uses surface water.
Where can I find a water quality report for Johnston County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 10 community systems are filed under Johnston County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Johnston County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Oklahoma water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Johnston County, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/johnston (data as of October 1, 2026).