Buying a Home With a Well in Latah County: The Water Checklist

By Trent, owner of Palouse Water Pros · Moscow, Idaho · September 2026

If you're buying a house on a private well anywhere in Latah County — outside Moscow, up toward Troy, Deary, or Princeton, or down around Genesee and Kendrick — the well is part of what you're buying. It's your water supply and sometimes the most expensive surprise after closing. I test and treat well water around here, and this is the checklist I'd want a friend to work through before they sign. Most of it just needs to happen before your inspection window closes.

What your lender may ask for

Lender rules depend on the loan type. Here's what the program guidelines say, as best I can tell — your loan officer has the final word.

• FHA: when a home has its own water supply, HUD's handbook puts it on the lender to make sure the water meets the requirements of the local health authority, falling back to EPA standards where no local standards exist. When a sample is needed, it has to be collected and handled by a qualified third party (a health authority, commercial lab, or another approved party) — not by the buyer, seller, or anyone else with a stake in the sale.
• VA: VA's minimum property requirements call for a safe, sanitary water supply that meets local health authority requirements, then state requirements, then EPA standards if neither exists.
• USDA: USDA's guaranteed-loan handbook includes a water analysis requirement for private wells, and the report can't be more than 180 days old at closing.
• Conventional loans: requirements vary by lender. Some ask for nothing; some ask for a bacteria and nitrate test. Ask early.

Whatever the lender wants is usually a safety minimum — typically bacteria and nitrate — and says nothing about iron, manganese, or hardness. I'm also not aware of a statewide Idaho program that tests private wells at sale. Private wells aren't regulated like public water systems, so the test that matters most is the one you order. The Idaho Department of Health and Welfare recommends private well owners test for bacteria and nitrate every year, and for arsenic, uranium, and fluoride every few years. For Latah County septic and well questions, the local health authority is Public Health – Idaho North Central District, which has a Moscow office.

Look up the well driller's report

Idaho keeps records of well construction, and you can search them yourself. The Idaho Department of Water Resources (IDWR) runs a Well Construction Search application — reachable from the "Wells" research pages on idwr.idaho.gov — that lets you pull up the Well Driller's Report (the well log). You can search by the well tag number (a "D" followed by seven digits, stamped on a tag IDWR began assigning in 1997), by township/range/section, by address, or by owner name.

A driller's report can show the well's depth, the casing depth and diameter, whether and how deep it was sealed, the water level when drilled, the rock the driller went through, and the flow rate at completion. IDWR notes that the database holds most reports from mid-1987 forward; older wells may not show up online, and you'd need to contact IDWR about historical records.

Questions to ask the seller

Ask in writing through your agent. "I don't know" is an answer too.

• How old is the well, and who drilled it?
• How deep is it, and where is the pump set? Has the pump been replaced, and when?
• Has the well ever run short? Late summer, while irrigating, or with a full house of guests.
• What treatment is installed, what does it treat, and who services it? Softener, iron filter, UV, RO under the sink — and whether it's actually running.
• Has the water ever tested positive for coliform bacteria? If so, what was done: shock chlorination, wellhead repair, continuous disinfection?
• Can I see past water test results? They show whether the water has changed.
• Where is the septic tank and drainfield, and when was the tank last pumped?

The checklist

Tests worth ordering beyond the basic panel

The typical real-estate test answers "is it safe to drink from a bacteria standpoint." It doesn't answer "what will this water do to the house." On Palouse wells — which mostly draw from fractured basalt and the sediments between flows, where low-oxygen water dissolves iron and manganese — these are the numbers I'd add:

• Manganese. It stains black at as little as 0.05 mg/L, and around 0.3 mg/L it reaches EPA health-advisory territory. It's also the one many "iron filters" miss.
• Iron, and its form. Iron stains at 0.3 mg/L. Whether it's dissolved (clear from the tap, orange later) or already oxidized (red or cloudy from the tap) changes the treatment approach.
• pH. Below about 6.8 or above about 8, oxidation-based iron and manganese removal gets harder to make work.
• Hardness. 7 grains per gallon and up is hard, and plenty of local wells run past that.
• Tannins. Tea-colored organics can bind iron and defeat standard filters. More common along the Highway 6 corridor — see my notes on Princeton and Potlatch.

If you're not sure what a lab report is telling you, how to read a well water test walks through it line by line.

Red flags on the walkthrough

• Toilet tank staining. Lift the lid. Orange-red film means iron; black or dark-brown slime means manganese.
• Bypassed or unplugged equipment. A softener or filter with the bypass valve turned, a dark control head, or an empty brine tank often means the system failed or was never right for the water.
• Well cap condition. Look for a cracked or loose cap, missing screws, an open conduit, or a casing that ends at or below grade. Those are paths for surface water and insects — a common reason for positive coliform results.
• Wellhead close to the septic. Idaho's septic rules (IDAPA 58.01.03) set minimum separation distances between wells and septic components. Check the current rules and ask Public Health – Idaho North Central District about the property's septic permit. A well that looks close, or downhill from the drainfield, deserves a harder look.
• Rotten-egg odor or scaled faucets. Odor has its own causes; scale points to hardness.

Using the results in negotiation

Iron, manganese, and hard water are normal on the Palouse. They're a line item to budget for, not a reason to walk away from a house you love. What you want from the results is a realistic idea of what treatment the house needs, so you can ask for a credit or a price adjustment based on real equipment rather than a guess.

Bacteria is different, and I'd take it seriously without panicking. A positive coliform result on a house that's been sitting empty sometimes has a straightforward wellhead cause; sometimes it needs more. Either way, it's reasonable to ask that the source be found and addressed, and that a retest come back clean before closing. Nitrate above the drinking water standard is a health issue worth resolving before you move in, especially with an infant or a pregnancy in the house.

Existing equipment isn't automatically worth anything. A properly sized, serviceable system is an asset; a mismatched, bypassed one is something you'll pay to remove.

Timing relative to closing

Order water testing as soon as you're under contract. Lab turnaround varies, bacteria samples have short holding times, and a positive result may mean a disinfection, a wait, and a retest — all of which has to fit inside your inspection and financing deadlines. If your lender needs its own sample handled a specific way, sort that out first so you don't sample twice. Keep in mind that USDA wants the report no older than 180 days at closing, and other lenders may set their own windows.

I can come out during your inspection period and test hardness, iron, manganese, pH, and more on-site, with you there, so you know what the water needs before you negotiate. I'll tell you honestly how soon I can get there — schedules vary. Details on that are on the water testing page.

How it works

1. Call or text with the address and your deadlines.
2. On-site testing, done in front of you — usually 45 to 75 minutes.
3. A clear recommendation: one option or a couple, never more equipment than the water needs.
4. A written proposal you can use in negotiation.
5. I build and install it myself after closing, with standard, serviceable parts.

For background, start with the Palouse well water guide or take the 2-minute water quiz. Town-specific notes are on the pages for Troy, Deary & Bovill, Genesee, Kendrick & Juliaetta, and Moscow and Viola. Treatment options are covered under iron and manganese removal and water softeners, and more answers are in the FAQ.