UPDATED: November 2003
| DEP | Montgomery County Department of Environmental Protection |
| DEPC | Montgomery County Department of Environmental Policy and Compliance |
| DHCD | Maryland Department of Housing & Community Development |
| DNR | Maryland Department of Natural Resources |
| DWPT | Maryland Department of Public Works & Transportation |
| LDS | Montgomery County DPS Land Development Services |
| MDE | Maryland Department of the Environment |
| MES | Maryland Environmental Service |
| MNCPPC | Maryland-National Park & Planning Commission |
| SHA | Maryland State Highway Administration |
| SWM | Montgomery County DPS Stormwater Management |
| WMD | Montgomery County Watershed Management Division |
| WS | Montgomery County DPS Wells and Septic |
| WSSC | Washington Suburban Sanitary Commission |
| ILLEGAL DUMPING HOTLINE | DEPC | 240-777-7700 (daytime) 240-777-DUMP (nighttime) |
| Blocked storm drain, inlet or pipe or erosion from public storm drain | DPWT | 240-777-ROAD (Highway Maintenance) |
| Construction in streams | MDE | 410-631-8094 |
| Discolored public drinking water, odor to drinking water | WSSC | 301-206-4002 |
| Emergency response (e.g. discharges, spills) | MDE | 410-631-3937 (nights & weekends) |
| Erosion, flooding, drainge problems between private properties | DHCD | 240-777-3600 (Code Enforcement) |
| Erosion - stream banks on park land | M-NCPPC | 301-405-2535 |
| Fire & Rescue Services | 911 (emergencies) 240-777-0744 (non-emergencies) |
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| Fish kills | MDE | 410-974-3238 or 800-285-8105 888-584-3110 (nights & weekends) |
| Fisheries - Central Regional Freshwater Fisheries Division | DNR | 410-442-2080 301-854-6060 (Mont. Co.) |
| Flooding and drainage problems on state roads | SHA | 310-513-7300 (Greenbelt) 301-948-2477 (Gaithersburg) |
| Illegal dumping on state park land | DNR | 301-924-2127 or 800-825-PARK |
| Leaking underground storage tanks | MDE | 410-631-3386 |
| Oil and anti-freeze recycling locations | MES | 800-473-2925 |
| Park Maintenance Problems - Trash, Beavers, Fallen Branches, Other | M-NCPPC | 301-670-8080 |
| Recycling Programs / Special pickup services | DPWT | 240-777-6400 or 6466 |
| Sanitary sewer problems | WSSC | 301-206-2002 |
| Sediment from construction sites entering streams | LDS | 240-777-6366 |
| Septic leaks / Septic tanks | WS | 240-777-6300 |
| Stormwater management, pond safety and maintenance | DEPC | 240-777-7770 |
| Stormwater management and sediment control plan review issues | SWM | 240-777-6320 |
| Stream clean-ups | WMD | 240-777-7712 |
| Swimming pool discharges | DEPC | 240-777-7770 |
| Trash and debris in parks and streams | MNCPPC | 301-495-2535 |
| Water main break | WSSC | 301-206-4002 |
| Water pollution (discharging, dumping, chemical spills into streams or storm drains | DEPC | 240-777-7770 |
| Water quality monitoring programs for schools (Stream Teams) | WMD | 240-777-6320 |
| Water rights & appropriations | MDE | 410-631-3591 |
| Wells and well inspections | WS | 240-777-6300 |