Ephemeroptera
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Solheimsvannet | Vestland, Norway | 1 | 1 | 0 | 1998-05-08 | |
| Sommerfjøs-myra | Møre og Romsdal, Norway | 1 | 1 | 0 | 2013-09-15 | |
| Songebekken | Agder, Norway | 1 | 1 | 0 | 1994-10-15 | |
| Spildervatnet | Nordland, Norway | 4 | 3 | 0 | 1994-06-10 | |
| Stamtjernbekken | Trøndelag, Norway | 4 | 3 | 0 | 1999-06-07 | |
| Stavsjø | Innlandet, Norway | 14 | 3 | 0 | 1993-06-07 | |
| Stavsjøen | Trøndelag, Norway | 1 | 1 | 0 | 2007-08-30 | |
| Steglevannet | Buskerud, Norway | 1 | 1 | 0 | 1989-10-06 | |
| Stidam Øst | Trøndelag, Norway | 1 | 1 | 0 | 2014-05-19 | |
| Stignavatnet | Vestland, Norway | 3 | 1 | 0 | 2013-06-12 | |
| Stignavatnet | Vestland, Norway | 1 | 1 | 0 | 2002-04-16 | |
| Stikla | Østfold, Norway | 3 | 3 | 0 | 1994-06-08 | |
| Stikletjern | Østfold, Norway | 1 | 1 | 0 | 1996-08-19 | |
| Stilla | Akershus, Norway | 1 | 1 | 1 | 2019-04-30 | |
| Stokkavatnet | Rogaland, Norway | 2 | 1 | 0 | 1995-09-05 | |
| Stokkavatnet | Rogaland, Norway | 1 | 1 | 0 | 2007-10-03 | |
| Stokkbekken | Trøndelag, Norway | 1 | 1 | 0 | 1994-06-14 | |
| Stokkdalstjønna | Trøndelag, Norway | 2 | 1 | 0 | 2015-06-08 | |
| Stokkedammen | Trøndelag, Norway | 1 | 1 | 0 | 2013-09-12 | |
| Storavatnet | Vestland, Norway | 2 | 1 | 0 | 2007-08-29 | |
| Storavatnet | Vestland, Norway | 15 | 8 | 0 | 1993-09-02 | |
| Stordammen | Akershus, Norway | 2 | 2 | 0 | 1989-09-08 | |
| Store Nesttunvann | Vestland, Norway | 1 | 1 | 0 | 2013-04-23 | |
| Storeidvatnet | Nordland, Norway | 1 | 1 | 0 | 1998-09-07 | |
| Storelva | Møre og Romsdal, Norway | 1 | 1 | 0 | 1994-09-13 | |
| Storelva | Vestland, Norway | 1 | 1 | 0 | 1999-09-01 | |
| Storetjørna | Vestland, Norway | 2 | 1 | 0 | 1998-05-20 | |
| Storsteinen, Jurdalen, Napp | Nordland, Norway | 1 | 1 | 0 | 2013-09-27 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Storvatnet | Trøndelag, Norway | 2 | 1 | 0 | 2004-09-14 | |
| Storåna | Rogaland, Norway | 3 | 3 | 0 | 1997-09-08 | |
| Stølevannet | Vestland, Norway | 1 | 1 | 0 | 1995-10-18 | |
| Sundkilen | Telemark, Norway | 3 | 3 | 0 | 1990-06-01 | |
| Svanevatnet | Rogaland, Norway | 8 | 6 | 0 | 1993-05-26 | |
| Svartaholtjørnet | Vestland, Norway | 15 | 5 | 0 | 1996-09-17 | |
| Svartebukta | Nordland, Norway | 1 | 1 | 0 | 2013-09-20 | |
| Svartelva | Innlandet, Norway | 1 | 1 | 0 | 2004-10-14 | |
| Svartelva, ved Fløta, Ådalsbruk | Innlandet, Norway | 1 | 1 | 0 | 2005-09-21 | |
| Svartputten | Oslo, Norway | 1 | 1 | 0 | 2003-06-06 | |
| Svartvatnet Tortenlia | Nordland, Norway | 2 | 1 | 1 | 2015-09-24 | |
| Svartåstjern | Buskerud, Norway | 1 | 1 | 0 | 1994-06-06 | |
| Svenåa | Akershus, Norway | 4 | 3 | 0 | 1997-05-28 | |
| Sverigetjern | Akershus, Norway | 1 | 1 | 1 | 2019-06-05 | |
| Svinna | Østfold, Norway | 2 | 2 | 0 | 1994-06-24 | |
| Svinna | Østfold, Norway | 1 | 1 | 0 | 2002-05-30 | |
| Sætertjern | Akershus, Norway | 5 | 4 | 0 | 1996-10-24 | |
| Sævelibekken | Agder, Norway | 4 | 1 | 0 | 1994-10-24 | |
| Tjennane | Telemark, Norway | 3 | 3 | 0 | 1994-05-11 | |
| Tomaso | Vestland, Norway | 4 | 2 | 1 | 2013-06-10 | |
| Tornesvatnet | Rogaland, Norway | 6 | 4 | 0 | 1994-09-05 |