Getting a septic permit in Bingham County

Who actually has authority

Start with the parcel, not the contractor’s truck:

• Most of Bingham County, including many lots around Blackfoot, Shelley, Firth, Aberdeen, and the rural roads in between: SIPH Environmental Health. Bingham County office: 145 W Idaho Street, Blackfoot, ID 83221, (208) 785-2160. District septic program: siphidaho.org. The 2025 application packet listed Bingham County EHS Elisha Mabey, (208) 479-3081, emabey@siph.id.gov. Staff assignments change; call the office.
• Inside a city sewer service area: you may be required to connect rather than install septic. Ask Blackfoot Public Works or the city that serves the lot, then SIPH. See sewer or septic.
• Fort Hall Reservation: the Shoshone-Bannock Tribal Water Resources Commission has permitting authority for septic systems. Do not mail a SIPH form and assume it covers tribal land.

What SIPH will not take without

The district’s septic-permit page and 2025 application packet say the file is incomplete until you provide:

1. A signed, dated application.
2. A scaled plot plan that matches the plot-plan checklist (buildings, wells on this lot and neighbors, water lines, tank, primary and replacement drainfields, ditches, canals, surface water within 300 feet, easements, slopes over 20%, north arrow).
3. A copy of the warranty deed or tax notice. The permit is issued to the name on the deed.
4. The fee. SIPH’s own materials disagreed in the documents we reviewed in September 2026: the 2025 application listed a full permit at $850 and a speculative site evaluation at $300; the public septic page listed a full permit at $925 in one place and $850 in the fee table, plus $300 tank-only, $3,000 large soil absorption system, and $40 renewal. Ask SIPH for the current Board of Health fee before you write a check.

Download the current packet from SIPH septic permits rather than photocopying last year’s PDF.

Test holes are your job

An onsite evaluation is required for every application. The owner or applicant must provide test holes a minimum of 8–10 feet deep, depending on soil, dug within 50 feet of the intended drainfield and the replacement area. SIPH Environmental Health Specialists read those holes for texture, limiting layers, and groundwater—not for a contractor’s convenience. If you skip the replacement-area hole, you have skipped half the legal system.

The application also asks whether city sewer or a central collection line is 200 feet or less from the structure. Answer that honestly. It is one of the first questions that changes the entire project.

After the permit is in hand

• Permits are typically valid for two years from the date issued. SIPH listed a renewal fee; renew before expiration if you still need the paper.
• The application and permit are not transferable to a new owner or a different site.
• Idaho requires a licensed basic or complex installer unless a homeowner installs a standard/basic system with no hired help. Complex systems need a complex installer. Bonds are $10,000 (basic) or $30,000 (complex) at the DEQ/health-district registration step.
• Leave the system open for inspection. The installer as-built report has to show the same setbacks the permit required.

When DEQ, not just SIPH, gets involved

Large soil absorption systems (2,500 gallons per day or more) need a nutrient-pathogen evaluation, a professional engineer licensed in Idaho, DEQ plan review, a complex installer, and annual operation reports. DEQ may also require an NP evaluation over sensitive aquifers, in nitrate priority areas, or where groundwater is within 10 feet, soils are coarse, or bedrock is shallow. Those are common conversations on lots near the Snake River Plain’s basalt and on small irrigated parcels.