Havant Water Hardness & Quality Report (2026)
Water Hardness
301+ mg/L
Very Hardestimated · not lab-verified
Source
mixed
pH Level
8.6
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
794.9 mg/L
Est. Daily Cost
£0.85
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–99
mg/L
Soft
100–149
mg/L
Slightly Hard
150–199
mg/L
Moderately Hard
200–300
mg/L
Hard
300+
mg/L
Very Hard
Appliance Damage Report
In Havant, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Havant | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Havant compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Havant, South East | ≈ 301+ mg/L | 28.1° | 🔴 Very Hard | mixed |
| Emsworth, South East | ≈ 300+ mg/L | 15° | 🔴 Very Hard | mixed |
| Waterlooville, South East | ≈ 300+ mg/L | 15.4° | 🔴 Very Hard | mixed |
| South Hayling, South East | ≈ 200–300 mg/L | 16.1° | 🟠 Hard | mixed |
| Hayling Island, South East | ≈ 300+ mg/L | 20.1° | 🔴 Very Hard | mixed |
National Benchmark
How Havant compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Havant | ≈ 301+ mg/L | 🔴 Very High |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Havant's Water Unique?
Local geology and source profile
Portsmouth Water supplies Havant and surrounding towns in Hampshire and West Sussex, drawing from a mix of surface reservoirs and groundwater boreholes. These sources tap into the Cretaceous Chalk Group aquifer, a principal water-bearing formation in the South East region. The water undergoes treatment at local facilities before reaching residents' taps.
The Havant catchment sits within the South East chalk basin, where the Cretaceous Chalk Group, a porous and fractured limestone, is the dominant geology. This formation readily dissolves calcium-rich minerals from rainwater percolation, resulting in a very hard water supply. While younger Tertiary sands and clays influence groundwater flow, they don't significantly reduce the mineral content.
Homeowners in Havant will notice substantial limescale accumulation in appliances like kettles, boilers, and washing machines due to the water's high mineral content. Regular descaling with household products is recommended, and fitting a water softener could significantly reduce scale, extending the lifespan and efficiency of your appliances. Portsmouth Water confirms its supply meets all UK drinking water standards, with PFAS levels well below regulatory limits.
Geology & Source: Cretaceous Chalk Group chalk and limestone; high calcium carbonate dissolution produces very hard water
Other South East Water Reports
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