In relation to an OWMS, ‘alter/alteration’ means any change
(other than general maintenance of the system)
- to the design or construction of
the system; or
- the operation of the system, or
- to the place or premises on or
in which the system is located,
which may increase the hydraulic flow (daily
flow rate) or organic load of the system.
Please note that if you are altering an OWMS that has an
all-waste septic tank you will need to provide confirmation that it was pumped
out within the last 3 – 5 years.
If your OWMS comprises of a sandfilter and is 15 years or
older, you will need to have the effluent sampled by a NATA accredited
laboratory to confirm that the effluent is being treated to a secondary
standard (20/30) or (20/30/10).
If your OWMS comprises of a treatment plant you will need to
provide confirmation that it has been serviced as per manufacturers’
requirements.