Well water in Harmon County, Oklahoma
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Testing recommended
tested well samples in Harmon County exceeded the EPA limit for nitrate (10 mg/L), based on public data from USGS Water Quality Portal.
231 test results across 10 contaminants from at least 31 wells, 1953 to 2001; chloride has the most at 32. Data refreshed September 3, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
What individual samples found
Each row summarizes every public sample for that contaminant inside Harmon 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 |
|---|---|---|---|---|---|---|
| Nitrate 1953 to 2001 | 31 | 94% | 4.8 | 17 | 10 mg/L EPA limit | |
| Copper 1987 | 22 | 14% | 0 | 20.1 | 1.3 mg/L EPA limit | |
| Lead 1987 | 22 | 5% | 0 | 1,600 | 15 ug/L EPA limit | |
| Fluoride 1953 to 1987 | 25 | 100% | 0.6 | 1.3 | 4 mg/L EPA limit | |
| Arsenic 1987 | 22 | 0% | 0 | 0 | 10 ug/L EPA limit | |
| Chloride 1953 to 1987 | no limit | 32 | 97% | 306 | 4,300 | 250 mg/L nuisance level |
| Sodium 1953 to 1987 | no limit | 26 | 100% | 224 | 4,030 | 20 mg/L health guideline |
| Iron 1953 to 1987 | no limit | 25 | 100% | 270 | 10,000 | 300 ug/L nuisance level |
| Manganese 1987 | no limit | 22 | 59% | 20 | 1,430 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: Uranium (4).
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 addressWhat this means
The contaminants most often above their limit here are nitrate (16% of 31 samples), copper (5% of 22 samples), and lead (5% of 22 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.
Chloride, Iron, and Manganese are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Harmon County
- 1Nitrate16% of 31 local samples were above the limit.
- 2Copper5% of 22 local samples were above the limit.
- 3Lead5% of 22 local samples were above the limit.
- 4Coliform bacteriaRecommended for every private well, every year.
- 5FluorideDetected in 100% of local samples.
- 6IronDetected in 100% of local samples.
- 7ChlorideDetected in 97% of local samples.
Test your Harmon County well for nitrate, copper and lead
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 $209Already 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 Harmon County numbers, $29. Every line explained, ranked by what matters, with the fix for each.
Wells in Harmon County
58 domestic wells in Harmon County are on record with the state since 1976. the typical well is 90 feet deep (one in ten goes past 148 feet).
In a typical Harmon County well, the median yield is 8 gallons per minute, 4% of wells yield under 3 gallons per minute and usually need a storage tank.
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 Harmon County
Blaine aquifer
Carbonate-rock. Limestone and dolomite move water through cracks and solution channels, sometimes very fast. Bacteria and nitrate can travel from the surface to a well in days, so annual bacteria testing matters more here than most places; hardness is a given.
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
Treatment that fits the local profile
Nitrate
Point-of-use reverse osmosis; Anion exchange; Distillation
Copper
Neutralizing filter to raise pH; Point-of-use reverse osmosis
Lead
Point-of-use reverse osmosis; Certified lead-removal carbon filter; Neutralizing filter to raise pH and stop leaching
Iron
Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Chloride
Point-of-use reverse osmosis; 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 nitrate
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For nitrate
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.
For copper
Acid neutralizing filter
whole-house, at the point of entry, about $1,200
Raises pH so plumbing stops leaching lead and copper.
For lead
Aquasana Claryum 3-Stage under-sink filter
under-sink or countertop, about $175
Certified to NSF/ANSI 53 to reduce 99% of lead and 99.7% of PFOA and PFOS at the tap. Not a fix for arsenic, nitrate or bacteria.
For iron
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
Free, no obligation
Get on the list for a free in-home water test in Harmon County
No water treatment company serves Harmon 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 Harmon County, and you get an email naming it first.
Common questions
How deep are wells in Harmon County?
The typical domestic well in Harmon County is 90 feet deep, based on 58 wells reported to the state since 1976. One in ten is deeper than 148 feet.
Is there arsenic in well water in Harmon County?
Arsenic was detected in 0% of 22 public well samples in Harmon County, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How often should I test a private well in Harmon 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 Harmon 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: 231 samples in Harmon 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.
- Oklahoma OWRB reported well logs: 846 well records in Harmon County, 58 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 .
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.