Well water in Comanche County, Oklahoma

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Testing strongly recommended

tested well samples in Comanche County exceeded the EPA limit for fluoride (4 mg/L), based on public data from USGS Water Quality Portal.

175 test results across 9 contaminants from at least 66 wells, 1939 to 2008; nitrate has the most at 67. Data refreshed September 15, 2026.

Compiled by Nick at Well Water Nerd from public records. How these pages are built

An estimated 3,395 people in Comanche County get their drinking water from a private well, per USGS 2015 county water use. That is about 3% of residents.

Separately, the USGS national arsenic model estimates that <1% of the 3,395 people on private wells in Comanche County draw water above 10 ug/L, from geology and well depth rather than local tests.

What individual samples found

Each row summarizes every public sample for that contaminant inside Comanche County. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.

Contaminant	Above limit	Samples	Detected	Median	Highest	Limit
Fluoride 1939 to 2008	58%	57	100%	7.44	35	4 mg/L EPA limit
Nitrate 1963 to 2001	9%	67	100%	0.6	82	10 mg/L EPA limit
Sodium 1965 to 2008	no limit	13	100%	64	492	20 mg/L health guideline

Sampled fewer than 10 times, too few to summarize: Arsenic (5), Lead (8), Copper (8), Uranium (1), Iron (8), Manganese (8).

Closer than the county

See the sampled wells near your address

The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.

Check my address

What this means

The contaminants most often above their limit here are fluoride (58% of 57 samples) and nitrate (9% of 67 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.

Iron is widespread in local groundwater. It is mainly a staining and taste problem, but high manganese also carries a health advisory for infants.

What to test for in Comanche County

1
Fluoride
58% of 57 local samples were above the limit.
2
Nitrate
9% of 67 local samples were above the limit.
3
Coliform bacteria
Recommended for every private well, every year.
4
Arsenic
Above the limit in 1 of 5 local samples; too few to quote a rate.
5
Iron
Detected in 63% of local samples.

Test your Comanche County well for fluoride, nitrate and coliform bacteria

Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.

Order the Tap Score well water test kit, from $209 Already tested? Upload the report

Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.

Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.

Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.

Where to get a well tested in Oklahoma: certified labs, state programs and prices.

Already have results back? Get your lab report read against the Comanche County numbers, $29. Every line explained, ranked by what matters, with the fix for each.

Wells in Comanche County

447 domestic wells in Comanche County are on record with the state since 1982. the typical well is 120 feet deep (one in ten goes past 260 feet).

In a typical Comanche County well, the median yield is 12 gallons per minute, 8% of wells yield under 3 gallons per minute and usually need a storage tank.

1980s

1990s

120

2000s

2010s

2020s

Find your own well's report

The state keeps the driller's report for most wells drilled since 1984. It tells you how deep your well is, where bedrock starts, and how much water it makes, which decides what treatment can work.

Open OWRB well log search and choose Water Well.
It lists depth, first water, yield and the driller.

Oklahoma has required well logs since 1972.

The rock under Comanche County

Not a principal aquifer

The USGS map places this area outside any principal aquifer, which usually means wells here draw from fractured bedrock or thin local deposits rather than a large regional aquifer. Bedrock wells of that kind are where arsenic, radon and uranium turn up, and yields vary from well to well.

Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the county centroid. A single well can sit in a different unit, especially near a boundary.

Official help in Oklahoma

Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.

Technical Assistance (private citizen well water testing), Oklahoma DEQ
Laboratory Accreditation, Oklahoma DEQ

Contamination sources on record in Comanche County

Oklahoma DEQ land sites records 5 regulated sites in Comanche County, among 5 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.

2: lined landfills and transfer facilities
3: other solid waste facilities

Treatment that fits the local profile

Fluoride

Point-of-use reverse osmosis; Activated alumina; Distillation

Nitrate

Point-of-use reverse osmosis; Anion exchange; Distillation

Systems we would look at first

Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.

For fluoride

Under-sink reverse osmosis system

under-sink or countertop, about $300

Look for NSF/ANSI 58 certification listing the contaminant you need removed.

For fluoride

Aquasana SmartFlow reverse osmosis

under-sink or countertop, about $225

Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.

Free, no obligation

Get on the list for a free in-home water test in Comanche County

No water treatment company serves Comanche County through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Comanche County, and you get an email naming it first.

Common questions

How deep are wells in Comanche County?

The typical domestic well in Comanche County is 120 feet deep, based on 447 wells reported to the state since 1982. One in ten is deeper than 260 feet.

How often should I test a private well in Comanche County?

Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.

Counties near Comanche County

Closest first. Groundwater does not stop at a line on a map, so the next county over is a fair second opinion.

Want the numbers themselves? Download the Oklahoma dataset as CSV, every county and town, with the sources named.

Sources

USGS Water Quality Portal: 175 samples in Comanche County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
USGS national arsenic model (Ayotte 2017): estimated share of 3,395 people on private wells in Comanche County above 10 ug/L of arsenic, from geology, well depth and land use. County estimates of domestic well users with arsenic above 10 ug/L from the USGS national logistic regression model (Ayotte, Medalie and Qi, 2017), with private well population from the USGS 2015 county water-use compilation (Dieter and others, 2018). Retrieved September 15, 2026.
Oklahoma OWRB reported well logs: 674 well records in Comanche County, 447 domestic. Well completion reports filed with the Oklahoma Water Resources Board, located by public land survey. Only aggregates are shown; owner names and addresses are never stored. Retrieved .
Oklahoma DEQ land sites: 5 regulated sites located in Comanche County. Superfund sites, voluntary cleanup sites and solid waste facilities from the Oklahoma Department of Environmental Quality. Retrieved September 18, 2026.

Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.