— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › East Hertfordshire › SG11 1 · postcode sector
5,697 people · median £445,000 · East Hertfordshire
East Hertfordshire Council · Green / Liberal Democrat coalition 26/50 seats · 52% · OCD 2026
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Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1007.2%
Flood zone17.2% of postcodes
Radonup to 1–3% of homes
Historic landfill2 sites within ~1 km
EA · UKHSA/BGS · Mining Remediation Authority — indicative, not a property search
Transport noise (Defra)
Road & rail noise bands (≥55 / ≥65 dB Lden) are being added — not yet available for this area. They cover major sources only; "not mapped" ≠ "quiet".
Defra strategic noise mapping
Heritage & green space
Listed buildings204
Conservation areas2
Green belt0.1%
Green spaces165
Historic England · OS Open Greenspace
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