Utah Admin. Code 317-4-13
TABLE 1.1 Minimum Lot Size (a) by Soil Type and Culinary Water Source | ||
Soil Type | Public Water Supply | Non-public Water Supply (b) |
1 | 12,000 sq. ft. | 1.00 Acre |
2 | 15,000 sq. ft. | 1.25 Acres |
3 | 18,000 sq. ft. | 1.50 Acres |
4 | 20,000 sq. ft. | 1.75 Acres |
5 (c) | 20,000 sq. ft. (c) | 1.75 Acres (c) |
TABLE 1.2 Soil Type Key (d) | |||
Soil Type | Soil Texture (e) | Soil Structure | Percolation Rate (minutes per inch) |
1 | Coarse Sand, Sand, Loamy Coarse Sand, Loamy Sand | Single Grain | 1-10 |
2 | Fine Sand, Very Fine Sand, Loamy Fine Sand, Loamy Very Fine Sand | Single Grain | 11-20 |
3 | Coarse Sandy Loam, Sandy Loam | Prismatic, Blocky, Granular | 21-40 |
4 | Coarse Sandy Loam, Sandy Loam | Massive, Platy | 41-60 |
Fine Sandy Loam, Very Fine Sandy Loam, Loam, Silt Loam | Prismatic, Blocky, Granular | ||
5 | Fine Sandy Loam, Very Fine Sandy Loam, Loam, Silt Loam | Massive, Platy | 61-120 |
Sandy Clay Loam, Clay Loam, Silty Clay Loam | Massive | ||
Sandy Clay Loam, Clay Loam, Silty Clay Loam, Sandy Clay, Clay, Silty Clay, Silt | Prismatic, Blocky, Granular | ||
6 (f) | Sandy Clay Loam, Clay Loam, Silty Clay Loam | Platy | >120 |
Sandy Clay, Clay, Silty Clay, Silt | Massive, Platy | ||
NOTES (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 2 Minimum Separation Distances in Feet (a) | |||
Item Requiring Setback | From Building Sewer or Effluent Sewer | From Septic, Pump, or Other Tank | From Absorption Area or Replacement Area |
Absorption or Replacement Area | 5 | (b) | |
Public Culinary Water Source | (c) | 100 (c) | 100 (c) |
Individual or Non-public Culinary Water Source (d) | 25 | 50 | 100 (c) |
Culinary Water Supply Line | (f) | 10(f) | 10(f) |
Lake, Pond, Reservoir (a) | 10 | 25 | 100 |
Watercourse (live or ephemeral stream, river, subsurface drain, or canal, storm water drainage systems) | 25 | 100 (g) | |
Building Foundation Without foundation drain With foundation drain | 5 10 | 5(h) 100 (i) | |
Curtain Drain | 10 | 10 | 100 (i) |
Dry wash, gulch, or gully | 25 | 50 (i) | |
Swimming pool, below ground | 3 | 10 | 25 |
Dry wells, basins | 5 | 25 | |
Down slope that exceed 35%. This includes any all natural slope or escarpment and any artificial cut, retaining wall, or embankment. | 10 | 50 (i) | |
Property line | 5 | 5 | 5 |
NOTES |
(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 3 Estimated Flow Rates of Wastewater (a) | |
Type of Establishment | Gallons per Day |
Airports a. per passenger b. per employee | 3 15 |
Boarding and Rooming Houses a. for each resident boarder and employee b. additional for each nonresident boarder | 50 per person 10 per person |
Bowling Alleys, not including food service | 85 per alley |
Camps a. developed with flush toilets and showers b. developed with flush toilets c. developed with no flush toilets | 30 per person 20 per person 5 per person |
Churches, per person | 5 |
Condominiums, Multiple Family Dwellings, or Apartments | 150 per bedroom |
Dentist's Office a. per chair b. per staff member | 200 35 |
Doctor's Office a. per patient b. per staff member | 10 35 |
Fairgrounds | 1 per person |
Fire Stations a. with full-time employees and food preparation b. with no full-time employees and no food preparation | 70 per person 5 per person |
Food Service Establishment (b) a. ordinary restaurants, not 24 hour service b. 24 hour service c. single service customer utensils only d. or, per customer served, includes toilet and kitchen wastes | 35 per seat 50 per seat 2 per customer 10 |
Gyms a. participant and staff member b. spectator | 25 per person 4 per person |
Hairdresser, per chair | 65 |
Highway Rest Stops, improved with restroom facilities | 5 per vehicle |
Hospitals | 250 per bed space |
Hotels, Motels, and Resorts | 125 per unit |
Industrial Buildings, exclusive of industrial waste a. with showers, per 8 hour shift b. with no showers, per 8 hour shift | 35 per person 15 per person |
Labor or Construction Camps | 50 per person |
Launderette | 580 per washer |
Mobile Home Parks | 400 per unit |
Movie Theaters a. auditorium b. drive-in | 5 per seat 10 per car space |
Nursing Homes | 200 per bed space |
Office Buildings and Business Establishments, not including food service, per eight hour shift | 15 per employee |
Picnic Parks, toilet wastes only | 5 per person |
Recreational Vehicle Parks a. temporary or transient with no sewer connections b. temporary or transient with sewer connections | 50 per space 125 per space |
Recreational Vehicle Dump Station, per self-contained vehicle | 50 |
Schools a. boarding b. day, without cafeteria, gymnasiums or showers c. day, with cafeteria but no gymnasiums and showers d. day, with cafeteria, gymnasium and showers | 75 per person 15 per person 20 per person 25 per person |
Service Stations, per day, per pump | 250 |
Skating Rink, Dance Halls, Ski Areas, or other recreation facility | 10 per person |
Stores, including Convenience Stores a. per public toilet room b. per employee | 500 11 |
Swimming Pools and Bathhouses, Using Maximum Bather Load | 10 per person |
Taverns, Bars, Cocktail lounges with No Food Service | 20 per seat |
Visitor Centers | 5 per visitor |
NOTES | |
(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. (b) No commercial food waste disposal unit shall be connected to an onsite wastewater system unless first approved by the regulatory authority. | |
TABLE 4 Minimum Standards for Building Sewer, Effluent Sewer, and | |
Distribution Pipe Materials (a) | |
Acceptable Building Sewer and Effluent Sewer Materials | |
Type of Pipe | Minimum Standard |
Acrylonitrile-Butadiene Styrene (ABS) | ASTM (b) D-2680 (c), D-2751, F-628 |
Polyvinyl Chloride (PVC) | ASTM D-2665, D-3033, D-3034 |
Acceptable Distribution Pipe Materials | |
ABS | ASTM D-2661, D-2751 |
Polyethylene (PE), Smooth Wall | ASTM D-3350 |
PVC | ASTM 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 industrial wastes. (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 5 Maximum Hydraulic Loading Rates for Percolation Testing | ||
Percolation Rate (Minutes per Inch) | Absorption Systems Hydraulic Loading Rates (a) (gal/ft2/day) (c)(d)(e) | Absorption Beds and Mound Systems Hydraulic Loading Rates (b) (gal/ft2/day) (c)(d)(f) |
0-10 (g) | 0.90 | 0.45 |
11-20 | 0.70 | 0.35 |
21-30 | 0.60 | 0.30 |
31-40 | 0.55 | 0.27 |
41-50 | 0.50 | 0.25 (h) |
51-60 | 0.45 | 0.22 (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 6 Maximum Hydraulic Loading Rates for Soil Classification | |||
Texture | Structure | Absorption 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 sand | Single grain | 0.90 (e) | 0.45 (e) |
Fine sand, very fine sand, loamy fine sand, loamy very fine sand | Single grain | 0.70 | 0.35 |
Coarse sandy loam, sandy loam | Massive Platy Prismatic, blocky, granular | 0.45 0.50 0.65 | 0.22 (f) 0.25 (f) 0.32 (f) |
Fine sandy loam, very fine sandy loam | Massive Platy Prismatic, blocky, granular | 0.40 0.35 0.50 | (g) (g) 0.25 (f) |
Loam | Massive Platy Prismatic, blocky, granular | 0.40 (e) 0.50 | (g) (g) 0.25 (f) |
Silt loam | Massive Platy Prismatic, blocky, granular | (e) (e) 0.45 | (g) (g) 0.22 (f) |
Sandy clay loam, clay loam, silty clay loam | Massive Platy Prismatic, blocky, granular | (e)(h) (i) 0.40 (e)(h) | (g) (i) (g) |
Silt, silty clay, sandy clay, clay | Massive Platy Prismatic, 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 7.1 Alternative Onsite Wastewater System Minimum Inspection Frequency(a) | |||
Type of System | Annual | Semiannual | Quarterly |
Pressure Distribution | X | ||
At-Grade (first 5 years only) | X | ||
Mound | X | ||
Packed Bed Media | X | ||
Sand Lined Trench | X | ||
Membrane Bioreactor | X | ||
Holding Tank | X | ||
Experimental System | X | ||
NOTES | |||
(a) Or more frequently as directed by the regulatory authority. | |||
TABLE 7.2 Components | |||||
Type of System | Septic Tank and Other Tanks | Distribution or Drop Boxes (if accessible) | Pumps, floats settings, Control Panel | Pressure Laterals, Absorption Area | Disinfection Unit (c) |
Pressure Distribution | X | X | X | ||
At-Grade | X | X | X | X | |
Mound | X | X | X | ||
Packed Bed Media | X | X | X | X | X |
Sand-Lined Trench | X | X | X | ||
Membrane Bio-reactor | X | X | X | X | |
Holding Tank | X | X | X | X | |
Experimental | X | X | X | X | X |
NOTES | |||||
(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 7.3 Effluent Sampling Parameters | |
Packed Bed Media and Membrane Bioreactor System | |
Routine Sampling Parameters Must sample Turbidity, or BOD5 and TSS. | |
Field Testing | Maximum Value |
Turbidity | =<20 NTU |
Laboratory Testing | Maximum Value |
BOD5 | =<25 mg/l |
TSS | =<25 mg/l |
COD (a) | =<75 mg/l |
E. coli (b) | 26/100 ml |
NOTES | |
(a) Chemical oxygen demand (COD) may be used in place of BOD5. (b) E. coli testing required when a disinfection unit is installed. | |
Utah Admin. Code R317-4-13