Charmhaven's earliest homes date from the 1960s with terracotta sewer laterals now 50–60
years old. Proximity to Budgewoi Lake means deteriorated clay joints also suffer hydrostatic
groundwater infiltration.
Jet blasting
$200–$500
CCTV drain inspection
$250–$450
Pipe relining (per metre)
$400–$800
Spring Creek and Wallarah Creek define Charmhaven's northern boundary. During heavy rainfall,
stormwater runoff overwhelms kerb inlets and residential drainage systems, causing overland flow
across properties.
Stormwater pit clearing
$150–$300
Gutter & downpipe repair
$100–$350
Surface drain installation
$500–$1,200
The Charmhaven Sewage Treatment Plant is receiving a $144 million upgrade (construction commencing
March 2026) to increase capacity to 75,000 equivalent persons. This directly services wastewater
from Charmhaven and surrounding suburbs.
Current capacity
Being upgraded
Future capacity
75,000 EP (provisions to 150,000)
Construction timeline
March 2026 – June 2028
Thirdi's $1.6 billion master-planned community on a 200-hectare site between the Pacific Highway
and Arizona Road will deliver up to 2,000 homes, a new school, and a business park. This means
massive demand for new plumbing connections.
New sewer connections
Growing demand
Affordable housing component
200 homes (Evolve Housing)
Environmental green space
120 hectares protected
