Pressurization equipment or devices and piping to be utilized upstream of a POWTS treatment or dispersal component consisting in part of in situ soil shall be designed and installed to produce a computed velocity of at least 2 feet per second.
Gravity piping within a POWTS treatment or dispersal component consisting in part of in situ soil shall be installed level or pitched downstream a maximum 4 inches per 100 feet.
(b) Distribution and drain pipe sizing.
The piping within a POWTS shall be of a diameter to permit the operation of the POWTS.
(c) Frost protection.
All POWTS components shall be protected from freezing temperatures that could detrimentally affect component operation to provide wastewater conveyance, treatment or dispersal.
(d) Component placement.
The orientation of a POWTS treatment or dispersal component consisting in part of in situ soil shall take into account landscape variations in elevation, slope orientation, and other conditions that could affect component performance relative to dispersal or aeration.
A POWTS component utilizing a mechanical device to treat wastewater or to distribute effluent shall be provided with an automatic visual or audible means of notifying the user of the POWTS of the failure of the mechanical device.
SPS 383.43 Note
In accordance with s. SPS 316.300 (1) (a)
, an alarm that is electrically powered is to be on a separate circuit from the circuit supplying power to the mechanical device.
An alarm indicating the failure of a pump shall remain audible or visible until manually turned off.
Where duplex pumping equipment is employed to provide continuous component operation in the event that one pump fails, the pumps shall be installed in such a manner so as to provide the continuous operation automatically.
A POWTS holding tank shall be provided with an automatic visual or audible means of notifying the user of the POWTS of the necessity for servicing.
The design of a POWTS shall include provisions to provide access to all components that require maintenance or observation.
(g) Anchoring system components.
An exterior subsurface POWTS treatment tank or POWTS holding component to be installed in an area subject to saturated conditions shall be installed so as to prevent flotation of the tank or component.
All treatment byproducts discharged from or as a result of operating a POWTS shall be disposed of so as not to create a human health hazard.
SPS 383.43 Note
The disposal of the contents of holding tanks and the sludge, scum, and contaminated liquids from treatment tanks and components is regulated by the department of natural resources under chs. NR 113
and NR 204
Deleterious or hazardous materials segregated out from effluent flows shall be disposed of in a manner conforming with the rules of the state agency having jurisdiction.
Effluent from a POWTS shall be dispersed so as not to create a human health hazard.
All POWTS components within a building or structure shall be gas tight unless provisions are made assuring the safety of individuals entering the building or structure.
(i) Site parameters and limitations.
POWTS treatment, holding and dispersal components shall be located so as to provide the minimum horizontal setback distances as outlined in Table 383.43-1 as safety factors for public health, waters of the state and structures in the event of component failure.
SPS 383.43 Note
Chapter NR 812
establishes upslope location criteria for wells relative to contamination sources.
- See PDF for table
OHWM = Ordinary High-Water Mark
a Except RV transfer tanks.
c Road-right-of-way lines may be more restrictive than property lines.
SPS 383.43 Note
See s. SPS 382.365
, Table 382.365-4 relative to horizontal setback distances to subsurface infiltrative systems.
SPS 383.43 Note
The department of transportation under s. Trans 233.08
establishes setback limits from the centerline of state trunk highways or connecting highways to structures and improvements which include septic systems.
A suction line or discharge line serving a holding tank for servicing purposes shall comply with all of the following:
A suction or discharge line shall terminate with a service port consisting of a quick disconnect fitting with a removable plug.
The service port of a suction or discharge line shall terminate at least 2 feet above final grade.
The service port of a suction or discharge line shall be secured to a permanent support that is capable of withstanding the loads and forces placed on the port.
A suction line serving a holding tank may not be installed in such a manner or arrangement that the tank can be drained by gravity or siphonic action.
Where a lift station is employed for servicing a holding tank, the pump discharge line shall conform with subd. 1.
, except as provided in subd. 3. a.
A discharge line from the lift station shall be at least 2 inches in diameter.
The lift station pump shall be activated by means of a keyed-switch at the service port.
SPS 383.43 History
Cr. Register, April, 2000, No. 532
, eff. 7-1-00; CR 02-129
: am. (2), (6) (intro.), and Table 83.43-1 Register January 2004 No. 577
, eff. 2-1-04; CR 07-100
: am. Table 83.43-1 Register September 2008 No. 633
, eff. 10-1-08; correction in (1), (7), (8) (i), (j) 1. a., Table 383.43-1 made under s. 13.92 (4) (b) 7.
, Stats., Register December 2011 No. 672
; CR 11-031
: am. Table 383.43-1 Register June 2013 No. 690
, eff. 7-1-13.
Parameters for POWTS components consisting of in situ soil. SPS 383.44(1)
POWTS treatment and dispersal components consisting in part of in situ soil shall be evaluated in accordance with ch. SPS 385
The quality of influent discharged into a POWTS treatment or dispersal component consisting in part of in situ soil shall be equal to or less than all of the following:
The monthly average under par. (a)
shall be calculated as the sum of all measurements taken over 30 consecutive days, with at least 6 measurements occurring on 6 separate days, and divided by the number of measurements taken during that period.
Influent discharged to a POWTS treatment or dispersal component that consists in part of unsaturated soil may not contain any solid or suspended solid exceeding 1/8 inch in diameter.
SPS 383.44 Note
Under s. SPS 383.03 (1) (b)
, the replacement of a POWTS anaerobic treatment tank (septic tank) in conjunction with this rule would limit any solids within the effluent leaving the tank to a maximum of 1/8-inch diameter.
The department may designate a new facility as “at-risk” if the department determines that the facility may generate waste with influent quality in excess of the parameters under par. (a)
. A facility designated as “at-risk” shall submit additional testing data as specified in par. (b)
to the department and the governmental unit within one year of installation of the POWTS components. A facility that continues to produce influent with parameters above the limits in par. (a)
or the approved design shall reduce wastewater strength according to the facility's management plan required under s. SPS 383.54 (1)
The infiltrative surface of unsaturated soil to which influent is discharged shall be located at least 24 inches above the estimated highest groundwater elevation and bedrock.
A POWTS designed utilizing a component manual recognized under s. SPS 383.60 (1)
shall have at least 6 inches of the soil separation required under par. (a)
an in situ soil type for which soil treatment capability has been credited under Table 383.44-3.
The purpose of the 6 inches of in situ soil under subd. 1.
shall be to assure that the influent will be assimilated into the original subsurface soils without ponding on the ground surface.
The infiltrative surface of unsaturated soil to which influent is discharged shall be located at least one inch below the finished grade.
Except as provided under subd. 2.
, the dispersal capability of a POWTS treatment or dispersal component consisting in part of unsaturated soil shall be limited to that specified in Table 383.44-2 based upon the influent quality concentrations being applied.
Under subd. 1. a.
, the influent quality parameter with the highest concentration shall determine the maximum application rate.
Except as provided in par. (c)
, the soil conditions at the infiltrative surface of unsaturated soil to which influent is to be discharged shall be used to establish the maximum application rate for a POWTS dispersal design.
The moist soil consistence of the soil horizon in which the infiltrative surface of a POWTS treatment or dispersal component will be located may not be stronger than firm or any cemented classification.
The maximum soil application for soil with moderate to strong platy structure shall not exceed 0.2 gals./sq. ft./day for effluent concentrations of ≤
30 mg/L BOD5
and TSS and shall be 0.0 gals./sq. ft./day for effluent concentrations of > 30 mg/L BOD5
Maximum soil application rates other than those specified in Table 383.44-2 may be employed for the design of a POWTS treatment or dispersal component consisting in part of in situ soil if documentation is submitted and approved under s. SPS 383.22
and is based on soil permeability and evapotranspiration estimates correlated to specific soil characteristics described in a detailed morphological soil evaluation.
The treatment capability of a POWTS treatment component consisting of unsaturated soil shall be limited to that specified in Table 383.44-3, unless otherwise approved by the department.
The design of a treatment or dispersal component consisting in part of in situ soil shall reflect restrictive soil horizons that affect treatment or dispersal.
Except as provided in subd. 2.
, the distribution of effluent to a treatment or dispersal component shall be by means of pressure distribution as specified in Tables 383.44-2 and 383.44-3.
Pressure distribution is not required when rehabilitating an existing non-pressurized in situ soil treatment or dispersal component that is persistently ponded and that has at least 24 inches of unsaturated soil beneath the infiltrative surface of the component.
Each dose of effluent by means of pressurized distribution into a treatment or dispersal component consisting in part of in situ soil may not be less than 5 times the void volume of the POWTS distribution laterals.
- See PDF for table
Note a: With ≤60% rock fragments
Note b: With >60 to <90% rock fragments
Note c: Requires pressure distribution under sub. (5) (a)
Note d: COS - Coarse Sand LVFS - Loamy Very Fine Sand SI - Silt
S-Sand COSL - Coarse Sandy Loam SCL - Sandy Clay Loam
LCOS - Loamy Coarse Sand SL - Sandy Loam CL - Clay Loam
LS - Loamy Sand FSL - Fine Sandy Loam SICL - Silty Clay Loam
FS - Fine Sand VFSL - Very Fine Sandy Loam SC - Sandy Clay
LFS - Loamy Fine Sand L - Loam C - Clay
VFS - Very Fine Sand SIL - Silt Loam SIC - Silty Clay
Note e: PL - Platy 0 - Structureless
PR - Prismatic 1 - Weak
BK - Blocky 2 - Moderate
GR - Granular 3 - Strong