Three Hills Pit
IndustrialInert
Three Hills Pit is a historic (closed) landfill site recorded by the Environment Agency near Welwyn Garden City, Hertfordshire. It received industrial and inert waste between 1980 and 1993, covering about 6.36 hectares. Reference EAHLD10035, October 2025 data revision.
Full record
| EA reference | EAHLD10035 |
|---|---|
| Site name | Three Hills Pit |
| Address | Heath Lane, Codicote, Hertfordshire |
| Site operator | M and P Bridge |
| Licence holder | J Murphy and Sons |
| Licence issued | 7 January 1980 |
| Licence surrendered | 19 April 1993 |
| First waste input | 7 January 1980 |
| Last waste input | 19 April 1993 |
| Area | 6.36 ha |
| Gas control | Not recorded |
| Leachate containment | Not recorded |
| Licensed site | Yes |
| EA area | North East TH |
| Grid reference | 521000, 218000 |
Source: Environment Agency Historic Landfill Sites dataset, October 2025 revision.
Boundary map
What these waste types mean
- Industrial:
- factory and process waste. Contents vary widely — some benign, some not; the site's operator and era are the clues.
- Inert:
- builder's rubble, subsoil, concrete, brick. Doesn't decompose or generate gas; the lowest-concern category.
Other historic landfill sites nearby
- Sisserverness Hill PitWaste types not recorded
- Fulling Mill LaneInert
- Fulling Mill LaneInert
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.