Seeking information (& contact info) for manufacturers (or lease/
rentals) of sensing equipment which can detect from surveillance
aircraft the ship discharges of oily bilge water and sewage.

Hello wetinterests and thank you for your question.

The Swedish Space Corporation manufactures a device called the MSS
5000.....
"MSS 5000 features 
SLAR (Side Looking Airborne Radar) for large area patrol of small
targets (150 km swath width), oil spill detection, etc.
IR/UV scanner for wake inspection and oil pollution mapping "
http://www.scag.swedishtrade.se/companies/swedish_space_corporation.htm

The contact details for the company are:

Swedish Space Corporation
P.O. Box 4207, SE-171 04 Solna Sweden
Tel +46 8 627 62 00
Fax +46 8 98 70 69
E-mail: ydo@ssc.se
www.ssc.se

=============================================

You might also be interested in this document:
"DEVELOPMENT OF AN AIRBORNE MULTISENSOR SYSTEM FOR OIL SPILL
               DETECTION AND CONTROL"
http://www.isprs.org/commission2/proceedings/paper/012_142.pdf

=============================================

Also:

"The Baseline Remote Sensing System (BRSS), developed in 1994 for the
Marine Spill Response Corporation (MSRC) by Atlantic Reconnaissance
Ltd., Coventry, UK and TerraMar Resource Information Services Inc.,
Mountain View, Calif. is an example of a system primarily designed for
oil pollution monitoring. In addition to oil detection, the sensor and
processing systems would be suitable for a variety of environmental
monitoring applications on regional and local scales."
http://www.eomonline.com/Common/Archives/Oct95/airborne.htm

I think the above article should also be of interest to you, and the
addresses of the companies mentioned above are:

Atlantique/Atlantic Reconnaissance Ltd
Company Address   Dakota House 
Coventry Airport 
Coventry 
CV8 3AZ 
United Kingdom  
      
Contact Name   Peter Wells  
Contact Title   Operations Director  
Contact Telephone   +44 (0)24 7630 7566  
Contact Email   AtlanticRecon@aol.com  
Company Telephone   +44 (0)24 7630 7566  
Company Fax   +44 (0)24 7688 2629  
Company Email   AtlanticRecon@aol.com  

and......

TerraMar Resource Information Services, Inc.
Mountain View, CA
(415) 964-6900, fax (415) 964-5430 

Thank you for your question and if you need any clarification of my
answer do not hesitate to ask.

Very best regards

THX1138

Search strategy included:
"pollution monitoring" slar  
://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&as_qdr=all&q=+%22pollution+monitoring%22+slar&btnG=Google+Search