Septic Systems and Source Water Protection in Cache County, Utah

A flat ban, not a design standard, inside Zone 1 and Zone 2

Cache County's code takes a harder line on septic near municipal water sources than most jurisdictions' general setback rules do: no part of a septic system -- not the tank, not the drainfield -- is permitted within Zone 1 or Zone 2 of a designated Source Water Protection Area. This isn't a distance-based design constraint that a bigger lot or an engineered system can work around; inside these zones, a new conventional or engineered septic system generally isn't an option at all under current code, independent of soil percolation results. For a raw-land buyer evaluating well-and-septic feasibility in the valley, that makes protection-zone status a threshold question to answer before spending money on a percolation test, not after.

The county has considered, but this research pass could not confirm has finally adopted, a narrower exception that would let an already-existing septic system inside Zone 2 be repaired in the event of failure, without extending the same allowance to new installations. If a parcel already has an existing septic system and sits inside Zone 2, that distinction -- repair of an existing system versus a new install -- is worth confirming directly with the county and the Bear River Health Department rather than assuming either way.

Checking a parcel's protection-zone status before you commit to anything

Source Water Protection Area boundaries are drawn around specific municipal wells and springs based on time-of-travel modeling for groundwater, not around visible landmarks, so a parcel's status isn't something you can eyeball from a map or infer from being "out in the county" away from Logan. Cache County's GIS Division and the Development Services Department's Planning & Zoning Division can confirm whether a specific parcel falls inside a mapped Zone 1 or Zone 2 boundary; a title company or the Bear River Health Department can typically confirm the same for a specific address as part of a septic-feasibility inquiry.

What a septic permit actually costs here

Outside a protection zone, septic permitting in Cache County runs through the Bear River Health Department, which administers septic feasibility for Box Elder, Cache, and Rich Counties together rather than through a standalone Cache County health office. As of this research pass, the department's published fee schedule for a conventional septic system permit is $840, made up of an $800 county permit fee plus a $40 Utah Department of Environmental Quality (DEQ) surcharge applied statewide. Related fees include $200 for a lot-site evaluation/feasibility review (typically done before committing to a full permit application), $800 for water-table monitoring where the site requires it, and $350 for an alteration permit if an existing system needs modification; a repair permit for an existing failed system carries no separate fee. These figures are meaningfully higher than a bare percolation-test cost, and worth budgeting for specifically rather than assuming septic approval is a minor added expense on top of land price.

Before you buy: the practical checklist

1. Confirm with Cache County GIS or Planning & Zoning whether the specific parcel falls inside a mapped Zone 1 or Zone 2 Source Water Protection Area -- do this before ordering a percolation test, since a Zone 1 or Zone 2 parcel may not be able to use one at all for a new system.
2. If the parcel is outside any protection zone, budget for the Bear River Health Department's actual fee schedule -- roughly $200 for the initial lot-site evaluation and $840 for the conventional permit itself, more if water-table monitoring is required.
3. If the parcel already has an existing septic system and sits inside Zone 2, confirm directly with the county and the health department whether repair (as opposed to new installation) is currently permitted for that system.
4. Don't assume a neighboring parcel's approved septic system means yours will qualify -- protection-zone boundaries can split a single road frontage, with one side of a boundary line inside a zone and the other side outside it.