Current through September 21, 2024
Greywater systems that meet the requirements of this section
are permitted by rule. A permit by rule requires the owner to submit the
information contained in paragraph (e) of this section to the Wyoming
Department of Environmental Quality, Water Quality Division prior to
constructing, modifying, or installing the system. By submission of the
required information, the owner acknowledges and certifies they will comply
with the requirements contained in this section.
(a) Greywater Operation and Requirements
(i) Restrictions
(A) Greywater shall not leave the property on
which it is generated. Ponding or runoff is prohibited.
(B) Greywater systems shall not be installed
in a delineated floodplain.
(C) The
volume of greywater shall not exceed an average of 2000 gallons per
day.
(D) Greywater shall not come
in direct contact with or adversely impact surface or groundwater.
(E) Food crops for direct human consumption
should not be harvested for 30 days after application of greywater.
(ii) Odor control of the greywater
system shall meet the requirement of Wyoming DEQ Air Quality Regulations
Chapter 2, Section
11.
(iii) If the greywater system is to be used
during the winter, the greywater system shall be designed to prevent
freezing.
(b) Estimating
Greywater Discharge
(i) The greywater
discharge for single family and multi-family dwellings shall be calculated by
estimates of greywater use based on water use records, or the following
procedure:
(A) The number of occupants of
each dwelling unit shall be calculated as 2 occupants per bedroom.
(B) The estimated greywater flows of each
occupant shall be calculated in gallons per day (gpd) as follows:
Showers, bathtubs and wash basins - 25 gpd/occupant
Laundry - 15 gpd/occupant
(ii) The total number of occupants shall be
multiplied by the applicable estimated greywater discharge as provided above
and the type of fixtures connected to the greywater system.
(c) Greywater System
Configurations
(i) All greywater systems
shall have means to direct greywater to either the blackwater system or the
greywater system.
(ii) Diverter
valves shall not have the potential to allow backflow from the blackwater
system into the greywater system.
(iii) Greywater used for surface irrigation
should be disinfected. The disinfection should achieve a fecal coliform level
of 200 cfu/100 mL or less.
(d) Setbacks
(i) A 30 foot buffer zone is required between
the greywater application site and adjacent property lines and any public
right-of-way.
(ii) A 30 foot
separation distance is required between greywater application sites and all
surface waters.
(iii) A 100 foot
separation distance is required between greywater application sites and all
potable water supply wells.
(e) Owner's name, address, phone number,
legal description of greywater system (address, latitude/longitude, or 1/41/4
section), and the date construction or installation will
begin.
