Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 811 - Requirements For The Operation And Design Of Community Water Systems › Subchapter IV - Pumping Stations, Pumphouses, and Water Treatment Plant Buildings › Section NR 811.25 - Buildings

Current through June 24, 2024
(1) CONSTRUCTION. All water system related
				  buildings under s.
				  NR
				  811.24 shall meet all of the following requirements:
(a) Have adequate space for the installation
				  of additional pumping units, water treatment equipment, chemical feed
				  equipment, or controls, if needed, and for the safe servicing of all
				  equipment.
(b) Be durable, fire and
				  weather resistant, and constructed in a manner to maximize sanitary protection
				  of the water supply.
(c) Be secure.
				  Buildings shall have at least one outward opening door to the outside. All
				  doors, windows, and hatches shall have locks. Any security alarms installed
				  shall be connected to telemetry control and SCADA systems where such systems
				  are used.
(d) Be landscaped to
				  conduct surface drainage away from the station and have a floor elevation at
				  least 6 inches above the finished grade and at least 2 feet above the regional
				  flood elevation as determined in s.
				  NR 116.07
				  (4). Buildings shall be provided with year
				  round dry land access. Below grade installations may be permitted only if the
				  terrain at the site is such that a gravity drain system can be provided.
				  Subsurface pits or pumprooms and inaccessible installations intended to house
				  well heads, pumps, pump motors, or pump controls for pumping stations are
				  prohibited except for below grade booster pumping stations as allowed per s.
				  NR 811.80 (3) and
				  (4).
(e) Provide for all floors to drain so that
				  floor runoff does not enter the treatment process or source water. Floors shall
				  be sloped to a drain or sump.
(f)
				  Provide a suitable outlet for drainage water from pump glands so that the
				  disposal of any drainage water is piped to waste or otherwise disposed of in a
				  controlled manner. Pump gland drainage piping shall not be directly connected
				  to a hub drain or a floor drain.
(g) Be provided with concrete
				  floors.
(h) Be provided with at
				  least one floor drain meeting the following requirements:
1. Floor drains and hub drains shall be
				  properly separated from a well. A floor or hub drain and associated piping
				  accepting water from pump gland drainage, a pressure relief or control valve, a
				  sampling faucet, or the floor shall be located no closer than 2 feet to the
				  outer well casing. No building drain piping, except that piping leading to the
				  aforementioned floor or hub drains, containing blackwater or graywater, may be
				  located closer than 8 feet to the outer well casing.
2. Floor drains and hub drains shall have a
				  discharge location that complies with all of the following requirements:
a. Floor drains and hub drains may be
				  connected to a sanitary sewer where available if the building floor elevation
				  is at least one foot above the rim elevation of the nearest upstream sanitary
				  sewer manhole. If a sanitary sewer is available but a manhole is not located
				  nearby or the manhole does not comply with the upstream location or the one
				  foot requirement, the department may require installation of an additional
				  manhole on the sanitary sewer main or on the sanitary building sewer.
Note:
The department recommends that the floor
					 drains from chemical feed rooms discharge to a sanitary sewer whenever
					 practicable.
b. Floor drains
				  and hub drains may discharge to the ground surface if the building drain and
				  building sewer piping will only carry water from the floor or hub drain, the
				  discharge location shall be at least 25 feet from the pumphouse, the exterior
				  invert of the building sewer pipe shall be at least 6 inches below the building
				  floor elevation and the exterior pipe opening shall be covered with a corrosion
				  resistant rodent screen. A greater distance may be required for drains of pump
				  stations serving wells constructed in sand and gravel formations. The piping
				  shall terminate in a location that will not allow backflow of surface water
				  into the building.
bm. A floor drain
				  or hub drain may be connected to a storm sewer where available if the building
				  drain and building sewer piping will only carry water from the floor or hub
				  drain and if the building floor elevation is at least one foot above the rim
				  elevation of the nearest upstream storm sewer manhole. If a storm sewer is
				  available but a manhole is not located nearby or the manhole does not comply
				  with the upstream location or the one-foot requirement, the department may
				  require installation of an additional manhole on the storm sewer main or on the
				  building sewer discharge line.
c.
				  Floor drains and hub drains may discharge to a buried tank located a minimum of
				  50 feet from the well if the discharge to the building drain and building sewer
				  piping will contain only water from pump gland drainage, a pressure relief or
				  control valve, a sampling faucet or floor drainage. These buried tanks may not
				  be installed unless approved by the department's bureau of watershed management
				  wastewater section prior to installation. Floor drains and hub drains may
				  discharge to a POWTS holding component located a minimum of 200 feet from the
				  well if the discharge will contain toilet, sink or other sanitary or domestic
				  waste. These POWTS holding components may not be installed unless approved by
				  the department of safety and professional services prior to installation. In
				  either case the rim elevation of the access manhole to the tank shall be at
				  least one foot below the building floor elevation and a high water alarm shall
				  be installed for the tank in accordance with the requirements of s.
				  SPS
				  383.43 (8) (e).
d. Soil infiltration components, including
				  french drains, are prohibited.
3. The drain may be a trench drain system if
				  the lowest elevation of any trench drain complies with subd. 2. a. Where trench
				  drains are to be connected to a sanitary sewer and compliance with subd. 2. a.
				  is not possible, a sump containing a sump pump shall be installed in the trench
				  to discharge the trench water with a minimum 2 pipe diameter free air break
				  over a hub drain. The top elevation of the hub drain shall be at least one foot
				  above the elevation of the nearest upstream sanitary sewer manhole rim. Where
				  trench drains will discharge to grade the exterior invert of the building sewer
				  pipe shall be at least 6 inches below the lowest elevation of the trench drain
				  and the exterior pipe opening shall be covered with a corrosion resistant
				  rodent screen.
4. Floor drains
				  shall be constructed of department of safety and professional services approved
				  plumbing materials. The building drain piping shall be constructed of cast iron
				  or PVC piping within 10 feet of the outer well casing.
(i) Pitless units shall be provided with a
				  locked and vented watertight enclosure fastened watertight to a concrete floor.
				  The enclosure shall be weather resistant, of sufficient size to accommodate all
				  well appurtenances and electrical or auxiliary power connections and be
				  accessible for year-round inspection, water sample collection, and water level
				  data collection. Any enclosure vents shall be shielded from the elements and
				  wind-blown debris and the vent openings shall be covered with 24-mesh corrosion
				  resistant screens. Backfill material for slab-on-grade enclosures shall be
				  compacted in lifts. Any slab-on-grade concrete floor shall have minimum
				  dimensions of 4 feet by 4 feet by 6 inches thick and be provided with
				  reinforcing.
(j) A small,
				  doghouse-type, enclosure may be installed over a well and abbreviated above
				  grade pump discharge piping where chemical addition equipment or
				  hydro-pneumatic pressure tank storage is located remote from the well. The
				  department may waive portions of the building installation requirements for
				  small enclosures. The enclosure shall be secured watertight to a concrete floor
				  and allow for convenient access to the well, piping and any appurtenances. The
				  enclosure shall be locked as applicable. If a floor drain will not be
				  installed, the floor shall be sloped to drain toward the access door if one is
				  provided.