Landfill Check

Historic landfill sites in Welwyn Garden City, Hertfordshire

The Environment Agency records 43 historic landfill sites in and around Welwyn Garden City, Hertfordshire. covering roughly 432 hectares in total. The largest is Cole Green at 60.43 ha. Recorded waste ranges up to special (hazardous) waste. Data: October 2025 revision.

Recorded landfill boundaries around Welwyn Garden City (indicative, digitised at 1:10,000).

All recorded sites, largest first

SiteAreaLast inputWaste types
Cole Green60.43 ha—Waste types not recorded
Blackbridge Landfill Site56.8 ha1980SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Cole Green29.23 ha—Waste types not recorded
Redland Gravel Limited26.75 ha—Liquid / sludgeIndustrialCommercialInert
Blackbridge Landfill Site24.99 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Blackbridge Landfill Site24.33 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Mardley Heath23.15 ha1976Inert
Cole Green19.22 ha1989SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Cole Green18 ha1990SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Cole Green13.49 ha1959SpecialIndustrialHouseholdCommercialInert
Land Adjacent to A41412.48 ha—Inert
Cole Green12.25 ha—Waste types not recorded
Cole Green11.06 ha—Inert
Cole Green10.97 ha—Waste types not recorded
Cole Green10.97 ha—Waste types not recorded
Cole Green9.6 ha1989SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Blackbridge Landfill Site8.94 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Cole Green Landfill Site8.48 ha1990Inert
Panshanger Park8.29 ha1982IndustrialHouseholdCommercialInert
Chequersfield7.26 ha—Waste types not recorded
Cole Green6.83 ha—Waste types not recorded
Three Hills Pit6.36 ha1993IndustrialInert
Cole Green2.87 ha—Waste types not recorded
Holwell Hyde2.22 ha1989SpecialIndustrialHouseholdCommercialInert
Blackbridge Landfill Site2.19 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Howell Court2.05 ha1984IndustrialInert
Holwell Hyde1.58 ha1970SpecialIndustrialHouseholdCommercialInert
Brochet Park1.57 ha—Waste types not recorded
Cole Green1.47 ha1990SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Coopers Tip1.43 ha1985Inert
Fulling Mill Lane1.05 ha1962Inert
Fulling Mill Lane0.94 ha1962Inert
Cole Green0.89 ha1990SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Holwell Court Farm0.74 ha1984IndustrialInert
Warrengate Farm0.67 ha1988Inert
Chequersfield0.58 ha—Inert
Sisserverness Hill Pit0.34 ha—Waste types not recorded
Gosling Stadium0.31 ha1986Inert
Gosling Stadium0.26 ha1986Inert
Blackbridge Landfill Site0.19 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Blackbridge Landfill Site0.13 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert
Panshanger Aerodrome0.12 ha1993Inert
Blackbridge Landfill Site0.09 ha1975SpecialLiquid / sludgeIndustrialHouseholdCommercialInert

What this data does — and doesn't — cover

  • Licensed-era records only. Waste licensing began in 1974. Older tips — especially small pre-war ones — are incompletely recorded, so absence from this data does not mean no landfill ever existed here.
  • Not the contaminated-land register. Councils hold a separate register of land determined as contaminated. A historic landfill entry is not a contamination determination, and vice versa.
  • Boundaries are indicative. Digitised at 1:10,000 scale; some are buffers around a point rather than surveyed edges.
  • Not a substitute for a formal environmental search. If you're buying, your conveyancer's environmental search checks this and several other sources.

EA Historic Landfill dataset, October 2025 revision. More on the methodology page.

Common questions

How many former landfill sites are there in Welwyn Garden City?
43 historic (closed) landfill sites are recorded within about 15km of Welwyn Garden City town centre in the Environment Agency's Historic Landfill dataset (October 2025 revision). Pre-1974 sites are incompletely recorded, so the true historical number is likely higher.
How do I check a specific address in Welwyn Garden City?
Search the postcode on Landfill Check — you'll see every recorded site within 1km, with distance, direction and waste types, measured to the site boundary.

Nearby areas

Worth reading: buying a house near a former landfill and what the waste types mean.