Seaford Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
115.4 mg/L
Est. Daily Cost
A$0.19
energy & soap waste
Source: BOM National Performance Report & ADWG · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Seaford, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Seaford | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.7 yrs | 8.5 yrs | -9% |
| Washing Machine | 11.4 yrs | 12 yrs | -5% |
| Water Heater | 13.3 yrs | 15 yrs | -11% |
Regional Water Comparison
How Seaford compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Seaford, Victoria | 58.5 mg/L | 🟢 Soft | reservoir |
| Frankston East, Victoria | 89 mg/L | 🟡 Moderately Hard | reservoir |
| Carrum Downs, Victoria | 13.5 mg/L | 🟢 Soft | reservoir |
| Frankston, Victoria | 89 mg/L | 🟡 Moderately Hard | reservoir |
| Frankston South, Victoria | 18 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Seaford compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Seaford | 58.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Seaford's Water Unique?
Local geology and source profile
Seaford's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water drawn from the Thomson Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges, Victoria. Water hardness in Seaford is measured at 58.5 mg/L — classified as soft — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Seaford, in the Frankston LGA on Port Phillip Bay's outer southern coastal strip — a relaxed coastal suburb of foreshore parks, the Seaford Beach, and beachfront cafés adjacent to the Seaford Wetlands nature reserve — receives a predominantly soft Yarra Ranges reservoir supply consistent with the outer southern Frankston coastal supply corridor and softer than the Langwarrin (71 mg/L) and Frankston East (89 mg/L) inland sub-zones in the same Frankston LGA.
Seaford's soft supply reflects a distribution sub-zone receiving predominantly direct Thomson and Upper Yarra reservoir supply with a moderate Winneke WTP fraction. The Thomson and Upper Yarra storages drain across Devonian granite and rhyodacite — highly resistant igneous terrain contributing negligible dissolved minerals. The Seaford coastal southern Frankston distribution sub-zone at 58.5 mg/L receives a proportionally higher direct Yarra Ranges supply fraction compared to the harder inland Frankston sub-zones, benefiting from the soft character of Melbourne Water's primary reservoir system.
Seaford residents enjoy low limescale accumulation on taps, in kettles, and around shower fittings — descaling every two to three months is typically adequate. Hot water systems accumulate minimal scale. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use in older Seaford beachside properties. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met. The soft supply benefits Seaford's active coastal community and the suburb's popular foreshore recreational and café precinct.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra catchment systems — the Seaford Frankston coastal south supply carries soft water at 58.5 mg/L, reflecting a moderate Yarra Ranges reservoir supply blend at this outer southern Frankston LGA coastal distribution sub-zone adjacent to the Port Phillip Bay foreshore.