Crofton Park Water Hardness & Quality Report (2026)
Water Hardness
22.2°Clark31.6°fH17.7°dH
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
915.6 mg/L
Est. Daily Cost
£0.72
energy & soap waste
Source: DWI Data Portal · 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 Crofton Park, your appliances are currently losing 42% efficiency due to mineral buildup.
| Appliance | In Crofton Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Crofton Park compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Crofton Park, Greater London | 316 mg/L | 22.2° | 🔴 Very Hard | mixed |
| Forest Hill, Greater London | 327 mg/L | 22.9° | 🔴 Very Hard | mixed |
| Brockley, Greater London | 315.5 mg/L | 22.1° | 🔴 Very Hard | mixed |
| Ladywell, Greater London | 316.5 mg/L | 22.2° | 🔴 Very Hard | mixed |
| Catford, Greater London | 280 mg/L | 19.6° | 🔴 Very Hard | mixed |
National Benchmark
How Crofton Park compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Crofton Park | 316 mg/L | 🔴 High |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Crofton Park's Water Unique?
Local geology and source profile
Thames Water supplies Crofton Park in the London Borough of Lewisham in south-east London near Forest Hill and Honor Oak, via the Thames Water south London ring main drawing from Bough Beech Reservoir in Kent and the River Thames at Walton. At 316 mg/L (22.2°Clark) and a TDS of 915.6 mg/L, Crofton Park's water is extremely hard — among the very hardest supplies anywhere in Greater London — driven by an exceptionally high chalk mineral fraction in the distribution blend reaching this part of the south-east London Lewisham supply zone.
The Bough Beech Reservoir receives water from the highly mineralised North Downs Chalk streams of the Eden Valley in west Kent, treated at Bough Beech works. In the Crofton Park and Forest Hill distribution zone, the Thames Water south London ring main blend appears to incorporate a remarkably high proportion of this deeply chalk-mineralised supply — producing 316 mg/L hardness with TDS 915.6 mg/L, comparable to the most extreme confined chalk aquifer zones in the entire UK dataset and dramatically exceeding the hardness recorded in neighbouring Lewisham zones like New Cross (194.5 mg/L) and Perry Vale (269 mg/L). This exceptional mineralisation suggests a specific supply routing through the south London network that delivers the most concentrated chalk fraction to the Crofton Park distribution sub-zone.
At 316 mg/L, limescale is an extreme household challenge in Crofton Park. Kettles must be descaled weekly to prevent rapid element failure. The combi-boiler faces very high risk of premature breakdown without a properly fitted, annually replaced scale inhibitor and frequent professional servicing. Washing-up liquid barely lathers without generous quantities of product. Taps, shower heads, and all basin fittings develop heavy chalk encrustation within days to one week; at minimum a weekly descaling with white vinegar or a proprietary product is essential. A whole-house water softener is very strongly recommended for all Crofton Park households.
Geology & Source: Supplied by Thames Water from the River Thames and Bough Beech Reservoir with a high chalk mineralisation fraction in the south-east London distribution — treated at Bough Beech Water Treatment Works — produces extremely hard water at 316 mg/L (22.2°Clark).