MAC Pt. 18, R. 1.5.6
IOWDS Classifications
Cite as Miss. Admin. Code Pt. 18, R. 1.5.6
IOWDS Classifications.
All residential IOWDS must comply with one (1) of the following:
1.
Design-based. An IOWDS that meets the following:
a.
Treatment:
i.
Septic Tank.
ii.
Advanced Treatment System.
b.
Disposal:
i.
Aggregate.
ii.
Aggregate Replacement.
iii.
Elevated Sand Mound.
iv.
Drip Irrigation.
v.
Spray Irrigation (disinfected).
vi.
Overland Discharge (disinfected).
vii.
Non-water borne.
2.
Engineer-based. An IOWDS that meets the following:
a.
Design-based.
b.
Performance-based.
3.
Performance-based. An IOWDS that is certified by a Licensed Professional Engineer to
meet the following minimum effluent standards:
a.
BOD5 – 10 mg/l.
b.
TSS – 10 mg/l.
c.
PO4-P – 15 mg/l.
d.
NH4-N – 10 mg/l.
e.
Fecal Coliform – 10,000 cfu/1000 ml.
f.
All IOWDS effluent must comply with the minimum effluent standards unless
background water quality is a higher number than these levels. In this case, the
background level will become the standard of performance.
g.
Background water levels and IOWDS effluent must be sampled in accordance
with Department guidelines. (To be forthcoming.)