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Dear Jonas
The Chironomidae of the subfamily Telmatogetoninae (genera Thallasomyia and Telmatogeton) are inhabitants of the marine intertidal to offshore windparks!
see: Sunose, T. & Fujisawa, T. 1982. ecological studies of the intertidal chironomid Telmatogeton japonicus Tokunaga in Hokkaido. Res. Popul. Ecol. 24:70-84. and recently also Raunio et al (2009) in http://www.aquati...o_etal.pdf.
Also (some) Ephydra species (Ephydridae) can be found in salt water. I know of only one paper: Krivosheina, M.G. (2003). To the biology of flies of the genus Ephydra Fallén, 1810 with the descriptions of larvae of seven Palaearctic species (Diptera:Ephydridae). Russian Entomol.J. 12 (1):79-86.
If necessary I can send you the papers (PDF).

The following species were also known (confined to) from haline/brackish waters alongthe coast (from literature records only, unless otherwise stated):
Chironomidae (also based on own records except for Clunio): some Procladius sp., Clunio marinus, Cricotopus ornatus, Halocladius varians, H. variabilis, Psectrocladius ventricosus, Chironomus aprillinus, C. halophilus, C. salinarius, Glyptotendipes barbipes, Microchironomus deribae, Tanytarsus gracilentus (not exclusively marine)
Culicidae: perhaps Anopheles atroparvus?
Limoniidae: Dicranomyia modesta, D. sera, D. ventralis, D. unicolor
Dolichopodidae: Dolichopus nubilus, Hydrophorus oceanicus, Hygrocoleuthes sp., Machaerium maritimum, Rhaphium consobrinum
Stratiomyidae: Nemoteles notatus, N. uliginosus
Syrphidae; Eristalinus aeneus
Tabanidae: Atylotus latistriatus (I have found the larva underneath grassrooths on the dike bordering a tidal zone (Land van Saefthinge,NL), so probably not aquatic.; Haematopota bigoti, Hybomitra expollicata (found the larva in a salty ditch)