1. c. single service customer utensils onlyd. or, per customer served, includes toilet and kitchen wastes2 per customer10Gymsa. participant and staff memberb. spectator25 per person4 per personHairdresser, per chair65Highway Rest Stops, improved with restroom facilities5 per vehicleHospitals250 per bed spaceHotels, Motels, and Resorts125 per unitIndustrial Buildings, exclusive of industrial wastea. with showers, per 8 hour shiftb. with no showers, per 8 hour shift35 per person15 per personLabor or Construction Camps50 per personLaunderette 580 per washerMobile Home Parks 400 per unitMovie Theatersa. auditoriumb. drive-in 5 per seat10 per car spaceNursing Homes200 per bed spaceOffice Buildings and Business Establishments, not including food service, per eight hour shift15 per employeePicnic Parks, toilet wastes only5 per personRecreational Vehicle Parksa. temporary or transient with no sewer connectionsb. temporary or transient with sewer connections50 per space125 per spaceRecreational Vehicle Dump Station, per self-contained vehicle50Schoolsa. boardingb. day, without cafeteria, gymnasiums or showersc. day, with cafeteria but no gymnasiums and showersd. day, with cafeteria, gymnasium and showers75 per person15 per person20 per person25 per personService Stations, per day, per pump250Skating Rink, Dance Halls, Ski Areas, or other recreation facility10 per personStores, including Convenience Storesa. per public toilet roomb. per employee50011Swimming Pools and Bathhouses, Using Maximum Bather Load10 per personTaverns, Bars, Cocktail lounges with No Food Service20 per seatVisitor Centers5 per visitorNOTES(a) When more than one use will occur, the multiple use shall be considered in determining total flow. Small industrial plants maintaining a cafeteria or showers and club houses or motels maintaining swimming pools or laundries are typical examples of multiple uses. Uses other than those listed above shall be considered in relation to established flows from known or similar installations.

   1. (b) No commercial food waste disposal unit shall be connected to an onsite wastewater system unless first approved by the regulatory authority.

      TABLE 4Minimum Standards for Building Sewer, Effluent Sewer, and Distribution Pipe Materials (a)Acceptable Building Sewer and Effluent Sewer MaterialsType of PipeMinimum StandardAcrylonitrile-Butadiene Styrene (ABS)ASTM (b) D-2680 (c), D-2751, F-628Polyvinyl Chloride (PVC)ASTM D-2665, D-3033, D-3034Acceptable Distribution Pipe MaterialsType of PipeMinimum StandardABSASTM D-2661, D-2751Polyethylene (PE), Smooth WallASTM D-3350PVCASTM D-2665, D-3033, D-3034, D-2729 (d)NOTES(a) Each length of building sewer, effluent sewer, and distribution pipe shall be stamped or marked.(b) American Society for Testing and Materials.(c) For domestic wastewater only, free from industrialwastes.(d) Although perforated PVC, ASTM D-2729 is approved for absorption system application, the solid-wall version of this pipe is not approved for any application.

      TABLE 5Maximum Hydraulic Loading Rates for Percolation TestingPercolation Rate(Minutes per Inch)Absorption SystemsHydraulic LoadingRates (a)(gal/ft2/day) (c)(d)(e)Absorption Bedsand Mound SystemsHydraulic Loading Rates (b) (gal/ft2/day) (c)(d)(f)0-10 (g)0.900.4511-200.700.3521-300.600.3031-400.550.2741-500.500.25 (h)51-600.450.22 (h)61-90 (i)0.40(j)91-120 (i)0.35(j)NOTES(a) The following formula may be used in place of the values in this table: q = 2.35 divided by the square root of the percolation rate and then add 0.15 where q is the hydraulic loading rate. In no case may the loading rate be greater than 1.0.(b) The following formula may be used in place of the values in this table: q = 1.2 divided by the square root of the percolation rate and then add 0.08 where q is the hydraulic

      loading rate. In no case may the loading rate be greater than 0.5.(c) Minimum absorption area is equal to the actual or estimated wastewater flow in gallons per day shown in Section R317-4-13 Table 3, divided by the hydraulic loading rate within the applicable percolation rate category.(d) For non-residential facilities, if a garbage grinder is not used, the absorption area may be reduced by 10% (0.9 multiplier). If any automatic sequence washer is not used, the absorption area may be reduced by 30% (0.7 multiplier). If both of these appliances are not used, the absorption area may be reduced by 40% (0.6 multiplier).(e) For any non-residential facility, a minimum of 150 square feet of trench bottom or sidewall absorption area shall be provided.(f) For any non-residential facility, a minimum of 300 square feet of absorption area shall be provided.(g) Soils with a percolation rate faster than 1 minute per inch are only acceptable with the use of an alternative packed bed media or membrane bioreactor system with a disinfection unit.(h) Not suitable for absorption beds.(i) Acceptable for alternative packed bed media or membrane bioreactor system only.(j) Not suitable for absorption beds or mounds.

      TABLE 6Maximum Hydraulic Loading Rates for Soil ClassificationTextureStructureAbsorption Systems Hydraulic Loading Rate (gal/ft2/day) (a)(b)(c)Absorption Beds and Mound Systems Hydraulic Loading Rate (gal/ft2/day) (a)(b)(d)Coarse sand, sand, loamy coarse sand, loamy sandSingle grain0.90 (e)0.45 (e)Fine sand, very fine sand, loamy fine sand, loamy very fine sandSingle grain0.700.35Coarse sandy loam, sandy loamMassivePlatyPrismatic, blocky, granular0.450.500.650.22 (f)0.25 (f)0.32 (f)Fine sandy loam, very fine sandy loamMassivePlatyPrismatic, blocky, granular0.400.350.50(g)(g)0.25 (f)LoamMassivePlatyPrismatic, blocky, granular0.40(e)0.50(g)(g)0.25 (f)Silt loamMassive(e)(g)

      PlatyPrismatic, blocky, granular(e)0.45(g)0.22 (f)Sandy clay loam, clay loam, silty clay loamMassivePlatyPrismatic, blocky, granular(e)(h)(i)0.40 (e)(h)(g)(i)(g)Silt, silty clay, sandy clay, clayMassivePlatyPrismatic, blocky, granular(i)(i)0.35 (e)(h)(i)(i)(g)NOTES(a) Minimum absorption area is equal to the actual or estimated wastewater flow in gallons per day, using Section R317-4-13 Table 3, divided by the hydraulic loading rate within the applicable soil texture and structure category.(b) For any non-residential facility, if a garbage grinder is not used, the absorption area may be reduced by 10% (0.9 multiplier). If any automatic sequence washer is not used, the absorption area may be reduced by 30% (0.7 multiplier). If both of these appliances are not used, the absorption area may be reduced by 40% (0.6 multiplier).(c) For any non-residential facility, a minimum of 150 square feet of trench bottom or sidewall absorption area shall be provided.(d) For any non-residential facility, a minimum of 300 square feet of absorption area shall be provided.(e) These soils are usually considered unsuitable for absorption systems, but may be suitable, depending upon the percentage and type of fines in coarse grained porous soils, and the percentage of sand and structure in fine grained soils. Percolation testing shall be used for further evaluation.(f) Not suitable for absorption beds.(g) Not suitable for absorption beds or mounds.(h) These soils may be permissible for a packed bed media or membrane bioreactor absorption system only.(i) These soils are unsuitable for any absorption system.

      TABLE 7.1Alternative Onsite Wastewater SystemMinimum Inspection Frequency(a)Type of SystemAnnualSemi-annualQuarterlyPressure DistributionXAt-Grade (first 5 years only)XMoundXPacked Bed MediaXSand Lined TrenchXMembrane BioreactorXHolding TankXExperimental SystemXNOTES(a) Or more frequently as directed by the regulatory authority.

      TABLE 7.2Components

      Type of SystemSeptic Tank and Other TanksDistribution or Drop Boxes(if acces-sible)Pumps, floats settings, Control PanelPressure Laterals, Absorp-tion AreaDisin-fection Unit (c)Pressure Distri-butionXXXAt-GradeXXXXMoundXXXPacked Bed MediaXXXXXSand-Lined TrenchXXXMem-brane Bio-reactorXXXXHolding TankXXXXExperi-mentalXXXXXNOTES(a) Inspect other components as directed by the regulatory authority.(b) Including pumping records.(c) Required for absorption systems installed in excessively permeable soils, or as directed by the regulatory authority.

      TABLE 7.3Effluent Sampling ParametersPacked Bed Media and Membrane Bioreactor SystemRoutine Sampling ParametersMust sample Turbidity, or BOD5 and TSS.Field TestingMaximum ValueTurbidity=<20 NTULaboratory TestingMaximum ValueBOD5=<25 mg/lTSS=<25 mg/lCOD (a)=<75 mg/lE. coli (b)26/100 mlNOTES(a) Chemical oxygen demand (COD) may be used in place of BOD5.(b) E. coli testing required when a disinfection unit is installed.

TABLE 1.1Minimum Lot Size (a) by Soil Type and Culinary Water Source

Soil TypePublic Water SupplyNon-public Water Supply (b)112,000 sq. ft.1.00 Acre215,000 sq. ft.1.25 Acres318,000 sq. ft.1.50 Acres420,000 sq. ft.1.75 Acres5 (c)20,000 sq. ft. (c)1.75 Acres (c)

TABLE 1.2Soil Type Key (d)Soil TypeSoil Texture (e)Soil StructurePercolation Rate (minutes per inch)1Coarse Sand, Sand, Loamy Coarse Sand, Loamy SandSingle Grain1-102Fine Sand, Very Fine Sand, Loamy Fine Sand, Loamy Very Fine SandSingle Grain11-203Coarse Sandy Loam, Sandy LoamPrismatic, Blocky, Granular21-404Coarse Sandy Loam, Sandy LoamFine Sandy Loam, Very Fine Sandy Loam, Loam, Silt LoamMassive, PlatyPrismatic, Blocky, Granular41-605Fine Sandy Loam, Very Fine Sandy Loam, Loam, Silt LoamSandy Clay Loam, Clay Loam, Silty Clay LoamSandy Clay Loam, Clay Loam, Silty Clay Loam, Sandy Clay, Clay, Silty Clay, SiltMassive, PlatyMassivePrismatic, Blocky, Granular61-120

6 (f)Sandy Clay Loam, Clay Loam, Silty Clay LoamSandy Clay, Clay, Silty Clay, SiltPlatyMassive, Platy>120NOTES(a) Excluding public streets and alleys or other public rights-of-way, lands or any portion thereof abutting on, running through or within a building lot for a single-family dwelling. These minimum lot size requirements do not apply to building lots that have received final local health department approval before the adoption of this rule. Any lot that is part of a subdivision that has received final local health department approval before the adoption of this rule is only exempt from the minimum lot size requirements if the developer has and is proceeding with reasonable diligence. Notwithstanding this grandfather provision for approved lots, the minimum lot size requirements are applicable if compelling or countervailing public health interests would require application of these more stringent requirements. The shape of the lot shall also be acceptable to the regulatory authority.(b) See the separation requirements in Section R317-4-13 Table 2.(c) A packed bed media or membrane bioreactor system is required for this soil type.(d) When there is a substantial discrepancy between the percolation rate and the soil classification, it shall be resolved to the satisfaction of the regulatory authority, or the soil type requiring the largest lot shall be used.(e) See the USDA soil classification system for a more detailed description.(f) These soils are unsuitable for any absorption system.

TABLE 2Minimum Separation Distances in Feet (a)Item Requiring SetbackFrom Building Sewer or Effluent SewerFrom Septic, Pump, or Other TankFrom Absorption Area or Replacement AreaAbsorption or Replacement Area5(b)Public Culinary Water Source(c)100 (c)100 (c)Individual or Non-public Culinary Water Source (d)2550100 (c)Culinary Water Supply Line(f)10 (f)10 (f)Lake, Pond, Reservoir (a)1025100Watercourse (live or 25100 (g)

ephemeral stream, river, subsurface drain, or canal, storm water drainage systems)Building Foundation Without foundation drainWith foundation drain5105 (h)100 (i)Curtain Drain1010100 (i)Dry wash, gulch, or gully2550 (j)Swimming pool, below ground31025Dry wells, basins525Down slope that exceed 35%. This includes any all natural slope or escarpment and any artificial cut, retaining wall, or embankment.1050 (j)Property line555NOTES(a) All distances are from edge to edge. Where surface waters are involved, the distance shall be measured from the high water line.(b) See Subsection R317-4-6(14) for setback requirements.(c) All distances shall be consistent with Rules R309-600 and R309-605.(d) Compliance with separation requirements does not guarantee acceptable water quality in every instance. Where geological or other conditions warrant, greater distances may be required by the regulatory authority.(e) For an ungrouted well or spring the distance shall be 200 feet. A private or individual well is considered to be grouted if it meets the construction standards required in Section R655-4-11, which requires a minimum 30-foot deep grout surface seal. Any private or individual well not constructed to this minimum standard is considered to be ungrouted. Although this distance shall be generally adhered to as the minimum required separation distance, exceptions maybe approved by the regulatory authority, taking into account geology, hydrology, topography, existing land use agreements, consideration of the drinking water source protection requirements, protection of public health and potential for pollution of water source. Any person proposing to locate an absorption system closer than 200 feet to an individual or non-public ungrouted well or spring must submit a report to the regulatory authority that considers the above items. In no case

may the regulatory authority grant approval for an onsite wastewater system to be closer than 100 feet from an ungrouted well or a spring.(f) If the water supply line is for a public water supply, the separation distance shall comply with the requirements of Rule R309-550. No culinary water service line may pass through any portion of an absorption area.(g) Lining or enclosing any watercourse with an acceptable impervious material may permit a reduction in the separation requirement. In any situation where the bottom of a canal or watercourse is at a higher elevation than the ground in which the absorption system is to be installed, a reduction in the distance requirement may be justified, but each case shall be decided on its own merits by the regulatory authority.(h) Horizontal setback between a deep wall trench or seepage pit and a foundation of any building is at least 20 feet.(i) The regulatory authority may reduce the separation distance, if it can be shown that the effluent will not enter the drain, but each case must be decided on its own merits by the regulatory authority. In no case may the regulatory authority grant approval for an absorption area to be closer than 20 feet.(j) This setback may be reduced if a 53 foot reference line originating at the bottom of the distribution pipe, sloped at 35% below horizontal, will not daylight or intersect the ground surface.

TABLE 3Estimated Flow Rates of Wastewater (a)Type of EstablishmentGallons per DayAirportsa. per passengerb. per employee315Boarding and Rooming Housesa. for each resident boarder and employeeb. additional for each nonresident boarder50 per person10 per personBowling Alleys, not including food service85 per alleyCampsa. developed with flush toilets and showersb. developed with flush toiletsc. developed with no flush toilets30 per person20 per person5 per personChurches, per person5Condominiums, Multiple Family Dwellings, or Apartments150 per bedroomDentist's Officea. per chairb. per staff member20035Doctor's Officea. per patientb. per staff member1035Fairgrounds1 per personFire Stationsa. with full-time employees and food preparationb. with no full-time employees and no food preparation70 per person5 per personFood Service Establishment (b)a. ordinary restaurants, not 24 hour serviceb. 24 hour service35 per seat50 per seat

KEY: waste water, onsite wastewater systems, alternative onsite wastewater systems, septic tanks

Date of Last Change: July 27, 2023

Notice of Continuation: January 10, 2025

Authorizing, and Implemented or Interpreted Law: 19-5-104