Related by context. Frequent words. (Click for all words.) 40 fracking 36 wells 36 San Bruno 35 Marcellus 35 coal ash 34 groundwater 34 Barnett Shale 34 Marcellus Shale 34 DEP 33 Deepwater Horizon 33 wastewater 33 hydraulic fracturing 32 septic systems 32 aquifer 31 Superfund site 31 Allentown 31 watersheds 31 tritium 30 septic tanks 30 wells drilled 29 hydrogen sulfide 29 natural gas 29 methane 28 shale gas 28 aquifers 28 Environmental Conservation 28 drilling 27 contaminants 27 methane gas 27 TCEQ 27 Powder River Basin 27 Tehachapi 27 Clean Water Act 27 shale 27 Macondo 27 tar sands 26 EPA 26 Chesapeake Energy 26 coal seam gas 26 exploratory drilling 26 sludge 26 wellhead 26 bed methane 26 Rancho Cordova 26 DEQ 26 Malibu 26 offshore drilling 26 reservoirs 26 spill 25 brine 25 oilsands 25 Palmdale 25 Colusa 25 Santa Barbara 25 EnCana 24 drillers 24 Lake Elsinore 24 Bakersfield 24 La Canada Flintridge 24 deepwater drilling 24 Glen Cove 24 coal mining 24 Drilling 24 Whittier 24 Newhall 24 oil sands 24 environmental 24 MTBE 23 toxic chemicals 23 Upland 23 Monte Vista 23 Irvington 23 Shale 23 fluoride 23 leaching 23 Santa Clarita Valley 23 Methane 23 San Pablo 23 Sierra Madre 23 Rockaway 22 Trout Unlimited 22 Lake Arrowhead 22 Lake Tahoe 22 Yorba Linda 22 Chino Hills 22 Moreno Valley 22 Ferndale 22 Oroville 22 San Marcos 22 Truckee 22 PFOA 22 Pleasant Hill 22 environmentalists 22 mercury emissions 22 Tulare County 22 Red Bluff 22 Barstow 22 Sylmar 21 Los Angeles 21 contaminate 21 Sacramento