The Governing Framework

Utah regulates onsite wastewater under:

• Rule R317-4 — Onsite Wastewater Systems. The substantive rule governing design, permitting, and operation of onsite systems statewide.
• R317-4-5 — Plan Review and Permitting.
• R317-4-6 — Design Requirements (tank capacity, absorption field sizing, materials).
• R317-4-10 — Wastewater Holding Tanks administrative, design, and installation.
• R317-4-13 Table 2 — Minimum setback distances.
• Utah Department of Environmental Quality (DEQ) — Division of Water Quality — state-level rule author and oversight.
• Local health departments — implement field permits. Utah's multi-county health districts handle most onsite permitting.

Septic Tank Capacity — R317-4-6

Utah uses two parallel sizing approaches:

Setback Distances — R317-4-13 Table 2

All onsite wastewater systems including the replacement area must conform to R317-4-13 Table 2 minimum setback distances. Consult Table 2 directly or your local health department for the complete setback schedule applying to your parcel. Setbacks govern distances from system components to water wells, surface water, water lines, property lines, buildings, and other sensitive features.

Construction Standards

Per R317-4, septic tanks must be:

• Constructed of sound, durable, watertight materials
• Resistant to excessive corrosion, frost damage, or decay
• Designed to be watertight and to withstand all expected physical forces

Polyethylene tanks meeting IAPMO/NSF listings and R317-4 construction standards qualify. Verify at order.

Permit Process

1. Contact your local health department. Most of Utah is covered by multi-county health districts (Davis County HD, Salt Lake County HD, Utah County HD, Weber-Morgan HD, etc.).
2. Site evaluation. Certified soil tester or health-department environmental specialist.
3. System design. Per R317-4-6. Licensed designer or installer prepares the plan.
4. Plan review and permit. Under R317-4-5. Fees typically $300–$700. Timeline 2–8 weeks.
5. Licensed installer construction. Utah certifies installers.
6. Final inspection. Local health department before backfill.

Regional Considerations

• Wasatch Front (Salt Lake, Utah, Davis, Weber counties): Largely on municipal sewer. Remaining septic on rural-fringe and benchlands.
• Bench and foothill sites: Steep terrain on Wasatch bench properties. Pressure dosing and mound systems common where conventional absorption fields won't work.
• High desert / Great Basin (Tooele, Juab, Millard): Deep alkaline soils, minimal rainfall, low water table. Standard trench systems typical.
• Red rock country (Washington, Kane, San Juan): Shallow soil over sandstone in many areas. Alternative systems often required. Moab and St. George growth areas have intensive permitting volumes.
• Uintah Basin: Oil-and-gas activity creates demand for temporary and semi-permanent septic for worker camps. Holding tank installations per R317-4-10 are common.
• Mountain communities (Park City, Heber, Summit): High-elevation installations require deep frost-line (48+ inches) cover. Snowmelt drainage affects absorption field performance.

Frequently Asked Questions

Why is unfinished basement counted as a bedroom?

Utah's rule anticipates lifetime use of the home. Homeowners frequently finish basements to add bedrooms after original construction — the tank must be sized to accommodate that likely future state. Sizing for day-one bedroom count leads to under-capacity systems when the finish project eventually happens.

What's the difference between septic and holding tank?

Septic tank discharges to an absorption field after primary treatment. Holding tank retains all wastewater for periodic pumping — no dispersal. Holding tanks are governed separately under R317-4-10 and are used where absorption fields aren't feasible (commercial temporary installations, remote cabins with poor soil, some specific lot situations).

Do I need PE-stamped plans?

For conventional single-family systems, typically no — a licensed installer can prepare designs. For larger or non-conventional systems (AOSS, large commercial, multi-residence), PE stamping is usually required. Check with your local health department.

Are polyethylene tanks accepted in Utah?

Yes. Major OEM rotomolded polyethylene tanks (Norwesco, Snyder, Chem-Tainer, Bushman) meeting IAPMO/NSF listings and R317-4 construction standards are approved. Verify specific model acceptance with your local health department.

Source Citations

• Rule R317-4 Onsite Wastewater Systems
• R317-4-6 Design Requirements
• R317-4-5 Plan Review and Permitting
• R317-4-10 Wastewater Holding Tanks
• Utah Admin Rules Current R317-4

Agricultural Tank Regulations — Utah Department of Agriculture and Food (UDAF)

The Utah Department of Agriculture and Food regulates pesticide, fertilizer, and commercial feed storage under Utah Code Title 4 with rules in the Utah Administrative Code (UAC) R68:

• UAC R68-7 — Utah Pesticide Control Act rules including registration, labeling, and applicator licensing.
• UAC R68-8 — Utah Commercial Feed Act rules.
• UAC R68-9 — Commercial Fertilizer rules.
• Utah Code 4-14 — Utah Pesticide Control Act statutory authority.
• Utah Code 4-13 — Commercial Fertilizer Act.

Utah's ag sector is dairy-heavy (Cache Valley, Millard, and Sevier counties), with significant alfalfa hay production, irrigated row crops and tree fruit along the Wasatch Front and in the Uintah Basin, and cow-calf range across the southeastern plateaus. Dairy-related feed and bulk-liquid-nutrient handling drive tank use; agrichemical dealers serving the intermountain irrigated belt run bulk liquid fertilizer (UAN, 10-34-0) and pesticide storage with 110% SPCC-style containment as operational default. UDAF coordinates with the Utah Department of Environmental Quality (DEQ) on incident response. Anhydrous ammonia references ANSI K61.1; the relatively compressed Utah growing season concentrates nurse-tank activity in early spring.

Oil & Gas Produced Water — Utah Division of Oil, Gas, and Mining (DOGM)

The Utah Division of Oil, Gas, and Mining regulates upstream oil and gas under UAC R649:

• UAC R649-3 — Drilling and operating practices.
• UAC R649-9 — Waste management and disposal — produced-water pits, tanks, closure, and surface impoundments.
• UAC R649-10 — Bonding.
• Utah Code 40-6 — Oil and Gas Conservation statute.

Utah's upstream sector centers on the Uintah Basin (Uintah and Duchesne counties) with Paradox Basin production in southeastern Utah. Uintah Basin operators handle significant produced-water volumes through evaporation pits, tank batteries, and Class II disposal wells. UAC R649-9 sets construction, lining, freeboard, and closure standards for produced-water pits and tanks. Polyethylene tanks handle chemical injection (scale, biocide, methanol); fiberglass and steel dominate produced-water service. DOGM permits pits under R649-9-2 and coordinates with Utah DEQ Division of Water Quality on groundwater-impact assessments.

Petroleum USTs — Utah DEQ Division of Environmental Response and Remediation (DERR)

Utah's UST program lives in DEQ DERR under UAC R311:

• UAC R311-201 — UST technical standards (design, installation, release detection, corrective action).
• UAC R311-202 — Environmental Assurance Program (state fund reimbursement).
• Utah Code 19-6-4 — UST statutory authority.

Utah UST owners register with DERR, pay annual fees supporting the Petroleum Storage Tank Trust Fund, maintain 2018 federal rule upgrades (walkthrough inspections, operator training, secondary containment for new tanks), and report suspected releases within 24 hours. The Environmental Assurance Program reimburses eligible corrective-action costs. AST facilities above federal SPCC thresholds coordinate with DEQ Division of Water Quality for spill-response and water-quality protection.

Septic System Sizing Deep Dive

Utah DEQ Division of Water Quality regulates onsite wastewater through UAC R317-4 (Onsite Wastewater Systems), with a 100 gpd per bedroom design flow basis:

Utah soils are highly variable: alluvial loams along the Wasatch Front and in the Cache and Utah Valleys, arid sand-and-gravel outwash in the Great Basin interior, red sandstone-derived profiles across the Colorado Plateau, and shallow stony profiles on the high Uintas. R317-4 requires a soil and site evaluation, licensed installer, and local health department permit. Alternative systems for failed perc include aerobic treatment units, mounds, drip dispersal, and sand-lined systems. Several Utah valleys sit over sole-source aquifers; the Cache Valley and Summit County in particular drive stricter nitrogen-reduction requirements on new OWTS.

Chemical Storage Secondary Containment & Spill Reporting

Federal SPCC (40 CFR 112) applies at 1,320 gallons aggregate aboveground oil. Utah layers on:

• UAC R317-1 — Definitions and general water-pollution-control authorities, including spill-reporting obligations to DEQ Division of Water Quality.
• UAC R315 — Utah hazardous waste rules incorporating RCRA Subtitle C.
• UAC R649-3-32 and related — DOGM reporting of upstream oil and gas releases.
• Utah Division of Emergency Management — EPCRA Tier II and State Emergency Response Commission coordination.

Report non-oil-and-gas releases to Utah DEQ and federal RQ releases to the National Response Center at 1-800-424-8802. Upstream oil and gas releases go to DOGM. Secondary containment at 110% is the SPCC and industry default. For state-specific RQ thresholds that diverge from 40 CFR 302.4, consult DEQ directly.

Permit Pathways at a Glance

• Residential OWTS: Local health department under UAC R317-4.
• Fertilizer & pesticide registration: UDAF under UAC R68 and Utah Code 4-13 / 4-14.
• Pesticide applicator license: UDAF under Utah Pesticide Control Act.
• Oil & gas produced water storage: DOGM under UAC R649-9.
• Petroleum UST: DEQ DERR under UAC R311.
• SPCC > 1,320 gal oil aggregate: Federal SPCC plan; state spill reporting to DEQ or DOGM.
• UPDES industrial stormwater: Utah DEQ Division of Water Quality.

Current fees change; verify with UDAF, DEQ, or DOGM before budgeting.

More Utah FAQs

Does Utah require containment for dairy waste storage ponds?

Yes — Utah CAFO permits under DEQ NPDES and UDAF coordination require engineered waste storage meeting NRCS Standard 313 or equivalent. Liner integrity, freeboard, and closure plans are enforced; larger dairies typically pull a UPDES permit.

How does DOGM treat Uintah Basin evaporation pits?

UAC R649-9 permits produced-water evaporation pits with construction, lining, fencing, and closure standards. Wildlife-exclusion netting or covers are common for bird-protection compliance under state coordination with federal Migratory Bird Treaty Act obligations.

Can I install a 3,000-gallon diesel tank at my remote mine without a permit?

Utah DEQ DERR jurisdiction applies to regulated USTs; ASTs above 1,320 aggregate aboveground oil trigger federal SPCC. Plan review and local fire marshal coordination apply regardless. Remote does not mean unregulated.

What is the Utah Environmental Assurance Program?

EAP (UAC R311-202) is the state petroleum tank fund reimbursing eligible UST owners for corrective-action costs above a deductible. Registration, fee payment, and compliance with release-detection and spill/overfill rules are prerequisites.

Is sole-source aquifer protection handled differently in Salt Lake Valley?

Yes — EPA Sole Source Aquifer designations and Utah drinking water source protection zones (DWSP) layer tighter siting, setback, and inspection requirements on tanks and OWTS in valleys where groundwater feeds municipal supply. Salt Lake, Davis, and Weber county sanitarians and Utah DDW coordinate on project review.