Collectors
| Name | Catchment |
|---|---|
| Opsterland | Opsterland (GM0086) |
| Orkney Islands Council | Orkney Islands (S30000040) |
| OsnabrückerServiceBetrieb | Osnabrück, Kreisfreie Stadt (DE944) |
| Oss | Oss (GM0828) |
| Overbetuwe | Overbetuwe (GM1734) |
| Oxford City Council | Oxford (E07000178) |
| Papendrecht | Papendrecht (GM0590) |
| Pembrokeshire County Council | Pembrokeshire (W06000009) |
| Pendle Council | Pendle (E07000122) |
| Perth and Kinross Council | Perth and Kinross (S30000043) |
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