Collectors
| Name | Catchment |
|---|---|
| Odsherred Kommune | Odsherred (306) |
| Oirschot | Oirschot (GM0823) |
| Oldebroek | Oldebroek (GM0269) |
| Oldenzaal | Oldenzaal (GM0173) |
| Oldham Council | Oldham (E08000004) |
| Olst-Wijhe | Olst-Wijhe (GM1773) |
| Ommen | Ommen (GM0175) |
| Oost Gelre | Oost Gelre (GM1586) |
| Ooststellingwerf | Ooststellingwerf (GM0085) |
| Opmeer | Opmeer (GM0432) |
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