If you own a private well near Washington, nitrate is one of the few things in your water that you cannot see, smell, or taste. It is a dissolved form of nitrogen. In the Franklin County area it can come from fertilizer on nearby farm ground, from animal waste, and from septic systems that sit too close to a well or drain into shallow groundwater. Public water customers have their supplier's testing behind them, but a private well has no one checking it except the owner. This guide covers what to check before you buy or install anything.
Start with a lab test, not a strip
Home test strips can give a rough screen for some substances, but nitrate results need a certified laboratory. Ask your county health office or a state-certified lab for a sample bottle and written instructions. Ask for nitrate reported as nitrogen, and ask whether the same report covers total coliform and E. coli, since those often come up together after heavy rain or flooding.
Collect the sample correctly
- Wash your hands and use only the bottle the lab supplied.
- Sample from a cold tap before any softener, filter, or treatment unit, so you see the water as it comes from the well.
- Remove the faucet aerator and let the line run for a few minutes first.
- Do not rinse the bottle or touch the inside of the cap.
- Keep the sample cool and get it to the lab within the time the lab specifies.
Look at the septic system and the well location
Pull your septic permit file or ask the county for a copy. Note where the tank, the drain field, and the well sit on your lot. Walk the yard after a rain and look for soft or wet spots, unusually lush grass over the field, or drains that run slowly. Ask when the tank was last pumped and whether anyone has inspected the distribution box. Pumping, repairs, and any changes to the system are work for a licensed septic contractor, not a do-it-yourself task.
Check the land use around you
Note whether the fields upslope or nearby are planted in row crops or used as pasture, and whether any livestock are kept close to the well. Fertilizer timing and manure spreading can change what reaches groundwater over the course of a year, so a single result is only a snapshot. Many homeowners retest in a different season, especially after a wet spring.
Retest after flooding or a sudden change
Floodwater can carry surface contaminants into a well and can shift nitrate and bacteria levels. If the river rose over your property, or if the water suddenly looks cloudy or tastes different, retest before using it for drinking or cooking. Keep every lab report in one place so you can compare results over time.
Reading the result before you treat
A nitrate result tells you what is in the water now. It does not tell you where the nitrate came from. Ask the lab to explain the reporting units and the detection limit printed on the report. If nitrate is present, match the result against your septic records and land-use notes before choosing a fix, because the likely source shapes the next step. A water softener is designed to address hardness and iron, not nitrate, so a softener alone will not solve a nitrate problem.
Treatment options to discuss with a qualified professional
- Point-of-use units at the kitchen tap, where the water is used for drinking and cooking.
- Whole-house systems that use an exchange media designed to remove nitrate.
- Reverse osmosis at a single tap.
Each option has its own maintenance schedule and its own retest needs. None should be installed or serviced without a written plan for how you will confirm that it is working.
Keep a simple well log
Write down each test date, the lab used, the results, the weather that month, and any septic work. Store the lab reports with your other well records. If you ever sell the property, a buyer or lender may ask for this history, and a clear log makes that conversation easier.