Editorial review
Reviewed by the Maplify Editorial Team. Editorial policy
Environment Agency, published geospatial feeds and OpenStreetMap
Sewage & Wastewater Infrastructure Map
Compare publicly available wastewater locations, treated-effluent discharge points and storm overflows before scoping drainage, pollution or planning work.
Verification
Compare publicly available wastewater locations, treated-effluent discharge points and storm overflows before scoping drainage, pollution or planning work.
How to Interpret the Map — Layer Key
Treated-effluent discharge point
Published treated-effluent discharge location. A point is not proof of a sewage treatment plant operating here.
Point markerWastewater treatment works (OSM)
Community-mapped wastewater works; facilities may be missing or outdated.
Point markerStorm overflow (CSO)
Reported combined sewer overflow location; this marker does not mean sewage is discharging right now.
Point markerHistoric consented discharge
A 2019 mapped consent location; check the current Environment Agency public register for legal status.
Point markerWhat This Layer Shows
Combine the public storm-overflow/CSO overlay with treated-effluent discharge sites and OpenStreetMap wastewater-treatment works. These are different records: a consent or discharge point is not automatically a treatment plant or a live sewage spill.
Company-area boundaries help identify the likely responsible sewerage undertaker, but cannot show every connection or service capacity. OpenStreetMap facilities are approximate and can be missing.
Why It Matters for Your Site or Property
Sewerage capacity, odour, flood risk and discharge impacts all matter in early site appraisal. Published point data helps identify where to seek further operator and Environment Agency evidence.
A storm overflow location only identifies a potential release point; current discharge status and annual duration must be sourced from the corresponding monitoring programme.
Planning and Property Impact
For a development proposal, request a sewer connection and capacity assessment from the sewerage undertaker, and consider odour or other amenity impacts where an operating wastewater works is nearby.
How to Interpret This Layer
- 1Open Maplify and expand Map layers > Water Industry > Sewage & Wastewater.
- 2Switch on Storm Overflows (CSO), Treated Effluent Discharge Sites and Wastewater Treatment Works (OSM).
- 3Inspect the source records and dates; use the EA annual EDM dataset for spill frequency and duration.
Official Data Source
Publisher
Environment Agency, published geospatial feeds and OpenStreetMap
Coverage
Environment Agency datasets principally cover England; OpenStreetMap coverage varies across the UK.
Licence
Publisher-specific open data terms; OpenStreetMap features under ODbL
Official source
https://www.data.gov.uk/collections/environment/storm-overflows
Data Freshness
Planned refresh frequency
Depends on the EA release and independent OpenStreetMap updates; not a live complete utility asset inventory
Important Limitations
- A publicly mapped treatment site is not an official inventory of working, permitted or operational wastewater plants.
- Sewage-pipe locations are addressed separately on the Pipe Networks guide and are not suitable for excavation or connection design.
- The map does not confirm an active sewage discharge, effluent compliance, odour impact or current sewer capacity.
Common Use Cases
Water consultants
Identify likely outfalls and published overflow records to follow up with regulatory evidence.
Developers
Spot wastewater-related constraints before commissioning capacity and drainage reports.
Related Layers
This layer is commonly checked alongside these related layers.
Frequently Asked Questions
Does an overflow pin mean sewage is flowing now?
No. A CSO marker is a location, not a real-time discharge observation. Check the relevant company live feed or published monitoring data.
Does the map show every sewage works?
No. Public regulator points and community-mapped sites are incomplete and not substitutes for the operator asset register.
Check Sewage & Wastewater Infrastructure Map on Maplify
Open the map, generate a site report or save your search to come back to it later.
References and Methodology
Professional disclaimer
Maplify is a screening and due-diligence tool. This layer does not constitute professional advice, a planning decision, or a legal determination of any kind. Always verify critical matters with the relevant local planning authority, the data provider, or a qualified professional before relying on this information for a transaction, planning application, or development decision.