Last reviewed: October 2026. This guide is general information, not legal advice. Rules and fees change, so confirm details with the agencies linked below.
A lot of homes in the Carson Valley are not on city sewer. Out in Johnson Lane, Ruhenstroth, Fish Springs, the Gardnerville Ranchos edges and parts of Carson City, the septic tank and leach field in the yard are the home’s sewer plant. When you buy that house, you buy that system too. A failed leach field can cost far more than most other inspection items, so it pays to look closely before you close.
Here’s a plain-English walkthrough of how to check a septic system when you buy a home in Douglas County or Carson City.
Step 1: Confirm the home is actually on septic
Don’t assume. Ask the listing agent, check the seller’s disclosure, and look for clues: a tank lid or riser in the yard, a cleanout pipe near the foundation, or a large, flat, grassy area with no trees (often the leach field).
In Nevada, sellers fill out a disclosure form under NRS 113.130. It asks about the sewage system and known problems. A disclosure is helpful, but it’s only what the seller knows. It is not an inspection.
Step 2: Pull the permit records
Every septic system in Nevada was supposed to be approved before it was built. Under NAC 444.784, you need approval from the local “administrative authority” to construct, alter or extend an individual sewage disposal system, and that approval comes before a building permit for the house. The application includes a plot plan showing, among other things:
- the number of bedrooms the system was designed for,
- the capacity of the septic tank,
- the location of every system component and nearby wells, and
- a reserve absorption area at least as large as the main leach field.
That plot plan is gold for a buyer. It tells you where the tank and field are, how big the tank is, and how many bedrooms the system was sized for.
Where to ask:
- Douglas County (Gardnerville, Minden, Genoa, Johnson Lane, Indian Hills, Ruhenstroth, Fish Springs): The Douglas County Building Division, part of Community Development, handles permits and inspections. They note you can request plans for existing homes through a public records request. Their listed contact is Community Development at (775) 782-6200, option 1.
- Carson City: Carson City Health and Human Services – Septic & Well regulates septic systems in the city, including pumping contractors and repair permits. Their listed number is (775) 887-2190.
Why bedrooms matter: If a home was permitted as a 3-bedroom and now has 5 bedrooms after a remodel, the septic system may be undersized for how the house will be used. That’s worth a conversation with your agent before you remove contingencies.
Step 3: Schedule a real septic inspection
A general home inspector usually does not open the tank. Ask for a dedicated septic inspection. A good one will typically:
- Locate and uncover the tank. Buried lids may need digging. Ask whether that’s included.
- Pump the tank (or have it pumped) so the inspector can see the walls, floor and baffles. Many inspectors want the tank pumped during the inspection, not days before, so they can watch how liquid flows back in.
- Check the inlet and outlet baffles and effluent filter, if there is one.
- Look for cracks, root intrusion, or a tank that’s sitting low on water, which can mean a leak.
- Look for backflow from the field. Liquid running back into the tank from the outlet can mean a saturated leach field.
- Walk the leach field for soggy spots, odors, unusually green stripes or surfacing water.
- Test pumps, floats and alarms if the system has them.
Want to know more about what we look for? See our septic inspection service page.
Step 4: Check the setbacks
Nevada’s minimum distances for septic systems are listed in NAC 444.792. A few that matter most to buyers:
| From | Septic tank | Leach (disposal) field |
|---|---|---|
| Building or structure | 8 ft | 8 ft |
| Property line | 10 ft | 10 ft |
| Private well (sealed to 50 ft) | 100 ft | 100 ft |
| Private well (not sealed to 50 ft) | 100 ft | 150 ft |
| Public water supply well | 150 ft | 150 ft |
| Large trees or shrubs | 10 ft | 10 ft |
Why you care: if a previous owner built a shed, garage, pool or addition on top of or right next to the leach field, it may violate setbacks and can make future repairs harder. If the home has a private well (common in rural Douglas County), the distance between the well and the septic system is important for your drinking water.
Step 5: Know the red flags
Walk away, renegotiate, or dig deeper if you see:
- Sewage odors in the yard or near the tank
- Soggy ground or standing water over the leach field when it hasn’t rained
- Slow drains or gurgling throughout the house
- A tank that has never been pumped, or no records at all
- Structures, driveways or paving over the leach field
- Bedroom count higher than the permitted design
- An old system with no record of a reserve area
Nevada’s rules consider a system “failed” if, for example, sewage is on the ground, sewage backs up into the home because the soil can’t absorb it, or a tank is leaking (NAC 444.784, subsection 6). A failed system needs repair, and repairs need permits.
Step 6: Build it into your timeline
Escrow moves fast. Book the septic inspection as early as possible, because:
- Finding and digging up buried lids can take time.
- If something is wrong, you’ll want a repair or drain field quote before your contingency period ends.
- Winter can complicate things. Frozen ground and snow cover make it harder to dig and to judge a leach field. See our winter septic tips.
Step 7: After you move in
Ask the seller for every pumping receipt and inspection report they have. Then start your own records. The U.S. EPA says household septic systems should generally be inspected at least every three years and tanks are typically pumped every three to five years (EPA: How to Care for Your Septic System). Curious about cost? See How Much Does Septic Pumping Cost in Carson Valley?
Areas this guide covers
We help buyers and sellers in Carson City, Gardnerville, Minden, Genoa, Johnson Lane, Indian Hills, Gardnerville Ranchos, Fish Springs, Ruhenstroth and Dayton.
Need a septic inspection before closing?
Call (775) 552-5179 and tell us your closing date. We’ll connect you with a local septic pro who can work around your escrow timeline.
Frequently asked questions
Does Nevada require a septic inspection before a home sale?
We couldn’t find a statewide rule requiring one. Sellers must complete the disclosure form under NRS 113.130. Your lender, loan program or purchase contract may add requirements, so ask your agent.
How do I find out how big the septic tank is?
Check the permit plot plan, which must list tank capacity under NAC 444.784. In Douglas County, ask the Building Division; in Carson City, ask Carson City Health and Human Services. The inspector can also confirm it on site.
Should the tank be pumped before the inspection?
Most inspectors prefer to be there when it’s pumped so they can see how the system behaves. Ask before the seller schedules a pump-out.
What if the house has more bedrooms than the septic permit?
Talk to your agent and the county. The system may be undersized, which can shorten its life or require an upgrade.
Sources
- NAC 444.784 – Permits, plot plan requirements and failure definition (Cornell LII)
- NAC 444.792 – Location and minimum setbacks (Cornell LII)
- Douglas County Building Division
- Douglas County Community Development
- Carson City Health and Human Services – Septic & Well
- NRS Chapter 113 – Seller disclosure
- U.S. EPA – How to Care for Your Septic System