Lennon, Smith, Souleret Engineering, Inc. (LSSE), founded in 1985, is an 90-person civil engineering and surveying firm with offices in Coraopolis (Allegheny County) and Greensburg (Westmoreland County), Pennsylvania. LSSE serves the municipal government, commercial, industrial, institutional, residential and utilities markets; and has a proven reputation for meeting client expectations.
LSSE specializes in providing water, wastewater, and stormwater engineering services.  LSSE provides surveying, permitting, facilities planning, civil design, construction phase services, GIS/mapping and asset management, and grants/funding procurement and administration services for wastewater collection, conveyance and treatment; water supply, treatment, storage, and distribution; stormwater management, low impact development, and flood protection; MS4 programs; infiltration/inflow (I/I) and source flow reduction; green infrastructure; sanitary sewer evaluation studies (SSES); Corrective Action Plans (CAP); flow monitoring; hydrologic and hydraulic modeling; and operations and maintenance programs.

LSSE’s water/wastewater facilities projects range from small maintenance programs to capital improvement projects over $65 million in construction value.