Legend (GAMA/Publications_Web_Map_Reference_Information)

DWR-Defined Groundwter Basins (v6.2) (52) ACTON VALLEY ADOBE LAKE VALLEY ALEXANDER VALLEY ALTURAS AREA AMERICAN VALLEY AMES VALLEY AMOS VALLEY ANDERSON VALLEY ANNAPOLIS OHLSON RANCH FM HIGHLANDS ANO NUEVO AREA ANTELOPE CREEK ANTELOPE VALLEY ARROYO DE LA CRUZ VALLEY ARROYO DEL HAMBRE VALLEY ARROYO SANTA ROSA VALLEY ARROYO SECO VALLEY ASH VALLEY AVAWATZ VALLEY BATIQUITOS LAGOON VALLEY BEAR VALLEY BERRYESSA VALLEY BESSEMER VALLEY BICYCLE VALLEY BIG LAGOON AREA BIG MEADOWS VALLEY BIG RIVER VALLEY BIG SPRING AREA BIG VALLEY BITTER WATER VALLEY BLACK SPRINGS VALLEY BLANCHARD VALLEY BODEGA BAY AREA BORREGO VALLEY BRANSCOMB TOWN AREA BRAY TOWN AREA BRIDGEPORT VALLEY BRISTOL VALLEY BRITE VALLEY BROADWELL VALLEY BROWN MOUNTAIN VALLEY BUCK RIDGE FAULT VALLEY BULL FLAT BURNEY CREEK VALLEY BURNS VALLEY BUTTE CREEK VALLEY BUTTE VALLEY CACTUS FLAT CADIZ VALLEY CADY FAULT AREA CAHUILLA VALLEY CALIFORNIA VALLEY CALZONA VALLEY CAMEO AREA CAMPO VALLEY CANEBRAKE VALLEY CARMEL VALLEY CARPINTERIA CARRIZO PLAIN CARSON VALLEY CASTAC LAKE VALLEY CASTRO VALLEY CAVES CANYON VALLEY CAYTON VALLEY CAYUCOS VALLEY CHEMEHUEVI VALLEY CHOCOLATE VALLEY CHOLAME VALLEY CHORRO VALLEY CHROME TOWN AREA CHUCKWALLA VALLEY CLAYTON VALLEY CLEAR LAKE CACHE FORMATION CLOVER VALLEY COACHELLA VALLEY COASTAL PLAIN OF LOS ANGELES COASTAL PLAIN OF ORANGE COUNTY COLES FLAT COLLAYOMI VALLEY COLLINS VALLEY CONEJO COPPER MOUNTAIN VALLEY COSO VALLEY COTTONEVA CREEK VALLEY COTTONWOOD SPRING AREA COTTONWOOD VALLEY COVELO ROUND VALLEY COW HEAD LAKE VALLEY COYOTE LAKE VALLEY COYOTE VALLEY COYOTE WELLS VALLEY CRONISE VALLEY CUDDEBACK VALLEY CUDDY CANYON VALLEY CUDDY RANCH AREA CUDDY VALLEY CUMMINGS VALLEY CUYAMA VALLEY DALE VALLEY DARWIN VALLEY DAVIES VALLEY DEADMAN VALLEY DEATH VALLEY DEEP SPRINGS VALLEY DENNING SPRING VALLEY DINSMORES TOWN AREA DIXIE VALLEY DOWNTOWN DRY BURNEY CREEK VALLEY DRY LAKE VALLEY DRY VALLEY EAGLE LAKE AREA EAST SALTON SEA EDEN VALLEY EEL RIVER VALLEY EGG LAKE VALLEY EL CAJON VALLEY EL MIRAGE VALLEY ELK CREEK AREA ELSINORE ESCONDIDO VALLEY EUREKA PLAIN EUREKA VALLEY FAIRCHILD SWAMP VALLEY FALL RIVER VALLEY FELTON AREA FENNER VALLEY FISH LAKE VALLEY FOOTHILL FORT BRAGG TERRACE AREA FORT ROSS TERRACE DEPOSITS FREMONT VALLEY FUNKS CREEK GARBERVILLE TOWN AREA GARCIA RIVER VALLEY GILROY-HOLLISTER VALLEY GOLD VALLEY GOLDSTONE VALLEY GOLETA GOOSE LAKE GOOSE VALLEY GRASS VALLEY GRASSHOPPER VALLEY GRAVELLY VALLEY GRAYS VALLEY GREENWATER VALLEY GRIZZLY VALLEY HALF MOON BAY TERRACE HAPPY CAMP TOWN AREA HARPER VALLEY HARRISBURG FLATS HARVEY VALLEY HAYFORK VALLEY HELENDALE FAULT VALLEY HEMET LAKE VALLEY HERNANDEZ VALLEY HETTENSHAW VALLEY HEXIE MOUNTAIN AREA HIDDEN VALLEY HIGH VALLEY HONEY LAKE VALLEY HONEYDEW TOWN AREA HOOPA VALLEY HORSE LAKE VALLEY HOT SPRINGS VALLEY HUASNA VALLEY HUMBUG VALLEY HUNGRY VALLEY HYAMPOM VALLEY IMPERIAL VALLEY INDIAN VALLEY INDIAN WELLS VALLEY IRON RIDGE AREA ISLAIS VALLEY IVANPAH VALLEY JACUMBA VALLEY JESS VALLEY JOHNSON VALLEY JOSEPH CREEK JOSHUA TREE KANE WASH AREA KELSO LANDER VALLEY KELSO VALLEY KENWOOD VALLEY KERN RIVER VALLEY KLAMATH RIVER VALLEY KNIGHTS VALLEY LAKE ALMANOR VALLEY LAKE BRITTON AREA LANFAIR VALLEY LANGFORD VALLEY LARABEE VALLEY LAS POSAS VALLEY LAST CHANCE CREEK VALLEY LAVIC VALLEY LAYTONVILLE VALLEY LEACH VALLEY LEE FLAT LITTLE ANTELOPE VALLEY LITTLE INDIAN VALLEY LITTLE LAKE VALLEY LITTLE VALLEY LIVERMORE VALLEY LOBOS LOCKWOOD VALLEY LONG VALLEY LOS BANOS CREEK VALLEY LOS OSOS VALLEY LOST HORSE VALLEY LOST LAKE VALLEY LOWER KINGSTON VALLEY LOWER KLAMATH RIVER VALLEY LOWER LAKE VALLEY LOWER LAYTONVILLE VALLEY LOWER MOJAVE RIVER VALLEY LOWER RUSSIAN RIVER VALLEY LUCERNE VALLEY MAD RIVER VALLEY MADELINE PLAINS MAJORS CREEK MALIBU VALLEY MARBLE CANYON AREA MARINA MARTIS VALLEY MASON VALLEY MATTOLE RIVER VALLEY MCCLOUD AREA MEADOW VALLEY MEANS VALLEY MESQUITE VALLEY MIDDLE AMARGOSA VALLEY MIDDLE CREEK MIDDLE FORK FEATHER RIVER MIDDLE MOJAVE RIVER VALLEY MIDDLE PARK CANYON MIL POTRERO AREA MISSION VALLEY MOHAWK VALLEY MONO VALLEY MONTECITO MORONGO VALLEY MORRO VALLEY MOUNTAIN MEADOWS VALLEY McDOWELL VALLEY NAPA-SONOMA VALLEY NAVARRO RIVER VALLEY NEEDLE ROCK POINT NEEDLES VALLEY NORTH FORK BATTLE CREEK NORTH FORK CACHE CREEK NOVATO VALLEY OCOTILLO-CLARK VALLEY OGILBY VALLEY OJAI VALLEY OLD VALLEY OLYMPIC VALLEY OROCOPIA VALLEY OTAY VALLEY OWENS VALLEY OWL LAKE VALLEY PAHRUMP VALLEY PAINTERS FLAT PAJARO VALLEY PALO VERDE MESA PALO VERDE VALLEY PAMO VALLEY PANAMINT VALLEY PANOCHE VALLEY PEACH TREE VALLEY PEPPERWOOD TOWN AREA PESCADERO VALLEY PETALUMA VALLEY PILOT KNOB VALLEY PINE CREEK VALLEY PINTO VALLEY PIPES CANYON FAULT VALLEY PITTSBURG PLAIN PIUTE VALLEY PLEASANT VALLEY PONDOSA TOWN AREA POPE VALLEY POTRERO VALLEY POTTER VALLEY POWAY VALLEY POZO VALLEY PRAIRIE CREEK AREA QUIEN SABE POINT VALLEY QUIEN SABE VALLEY RACE TRACK VALLEY RAFAEL VALLEY RANCHITA TOWN AREA RAYMOND RED PASS VALLEY RED ROCK VALLEY REDDING AREA REDWOOD CREEK AREA RHODES HILL AREA RICE VALLEY RIGGS VALLEY RINCONADA VALLEY ROCK PRAIRIE VALLEY ROSE VALLEY ROSS VALLEY ROUND VALLEY RUSSELL VALLEY SACRAMENTO VALLEY SALINAS VALLEY SALINE VALLEY SALT WELLS VALLEY SAN ANTONIO CREEK VALLEY SAN BENITO RIVER VALLEY SAN CARPOFORO VALLEY SAN DIEGO RIVER VALLEY SAN DIEGUITO CREEK SAN ELIJO VALLEY SAN FELIPE VALLEY SAN FERNANDO VALLEY SAN GABRIEL VALLEY SAN GREGORIO VALLEY SAN JACINTO SAN JOAQUIN VALLEY SAN JUAN VALLEY SAN LUIS OBISPO VALLEY SAN LUIS REY VALLEY SAN MARCOS AREA SAN MATEO VALLEY SAN ONOFRE VALLEY SAN PASQUAL VALLEY SAN PEDRO VALLEY SAN RAFAEL VALLEY SAN RAMON VALLEY SAN SIMEON VALLEY SAND POINT AREA SANEL VALLEY SANTA ANA VALLEY SANTA BARBARA SANTA CLARA RIVER VALLEY SANTA CLARA VALLEY SANTA CRUZ PURISIMA FORMATION SANTA MARGARITA VALLEY SANTA MARIA SANTA MARIA VALLEY SANTA ROSA FLAT SANTA ROSA VALLEY SANTA YNEZ RIVER VALLEY SCOTT RIVER VALLEY SCOTTS VALLEY SEARLES VALLEY SECRET VALLEY SEIAD VALLEY SEVEN OAKS VALLEY SHASTA VALLEY SHERWOOD VALLEY SIERRA VALLEY SILVER LAKE VALLEY SIMI VALLEY SLINKARD VALLEY SMITH RIVER PLAIN SODA LAKE VALLEY SOQUEL VALLEY SOUTH SAN FRANCISCO SPRING CANYON VALLEY SQUAW FLAT STONY GORGE RESERVOIR STONYFORD TOWN AREA SUISUN-FAIRFIELD VALLEY SUNOL VALLEY SUPERIOR VALLEY SURPRISE VALLEY SWEETWATER FLAT SWEETWATER VALLEY TAHOE VALLEY TEHACHAPI VALLEY EAST TEHACHAPI VALLEY WEST TEMECULA VALLEY TEN MILE RIVER VALLEY TERWILLIGER VALLEY THOUSAND OAKS AREA TIA JUANA TIERRA REJADA TOAD WELL AREA TORO VALLEY TRES PINOS VALLEY TULEDAD CANYON VALLEY TWENTYNINE PALMS VALLEY UKIAH VALLEY UPPER KINGSTON VALLEY UPPER LAKE VALLEY UPPER MOJAVE RIVER VALLEY UPPER OJAI VALLEY UPPER SANTA ANA VALLEY VALLECITO-CARRIZO VALLEY VALLECITOS CREEK VALLEY VANDEVENTER FLAT VENTURA RIVER VALLEY VIDAL VALLEY VILLA VALLEY VISITACION VALLEY WALKER BASIN CREEK VALLEY WARD VALLEY WARNER VALLEY WARREN VALLEY WEOTT TOWN AREA WEST SALTON SEA WEST SANTA CRUZ TERRACE WESTSIDE WILD HORSE MESA AREA WILDROSE CANYON WILLIAMS VALLEY WILLOW CREEK VALLEY WILSON GROVE FORMATION HIGHLANDS WILSON POINT AREA WINGATE VALLEY YAQUI WELL AREA YELLOW CREEK VALLEY YGNACIO VALLEY YOSEMITE VALLEY YUMA VALLEY DWR-Defined Groundwater Basins (2003, used for prioritizing GAMA basins) (69) ACTON VALLEY ADOBE LAKE VALLEY ALEXANDER VALLEY ALTURAS AREA AMERICAN VALLEY AMES VALLEY AMOS VALLEY ANDERSON VALLEY ANNAPOLIS OHLSON RANCH FM HIGHLANDS ANO NUEVO AREA ANTELOPE CREEK ANTELOPE VALLEY ARROYO DE LA CRUZ VALLEY ARROYO DEL HAMBRE VALLEY ARROYO SANTA ROSA VALLEY ARROYO SECO VALLEY ASH VALLEY AVAWATZ VALLEY BATIQUITOS LAGOON VALLEY BEAR VALLEY BERRYESSA VALLEY BESSEMER VALLEY BICYCLE VALLEY BIG LAGOON AREA BIG MEADOWS VALLEY BIG RIVER VALLEY BIG SPRING AREA BIG VALLEY BITTER WATER VALLEY BLACK SPRINGS VALLEY BLANCHARD VALLEY BODEGA BAY AREA BORREGO VALLEY BRANSCOMB TOWN AREA BRAY TOWN AREA BRIDGEPORT VALLEY BRISTOL VALLEY BRITE VALLEY BROADWELL VALLEY BROWN MOUNTAIN VALLEY BUCK RIDGE FAULT VALLEY BULL FLAT BURNEY CREEK VALLEY BURNS VALLEY BUTTE CREEK VALLEY BUTTE VALLEY CACTUS FLAT CADIZ VALLEY CADY FAULT AREA CAHUILLA VALLEY CALIFORNIA VALLEY CALZONA VALLEY CAMEO AREA CAMPO VALLEY CANEBRAKE VALLEY CARMEL VALLEY CARPINTERIA CARRIZO PLAIN CARSON VALLEY CASTAC LAKE VALLEY CASTRO VALLEY CAVES CANYON VALLEY CAYTON VALLEY CAYUCOS VALLEY CHEMEHUEVI VALLEY CHOCOLATE VALLEY CHOLAME VALLEY CHORRO VALLEY CHROME TOWN AREA CHUCKWALLA VALLEY CLAYTON VALLEY CLEAR LAKE CACHE FORMATION CLOVER VALLEY COACHELLA VALLEY COASTAL PLAIN OF LOS ANGELES COASTAL PLAIN OF ORANGE COUNTY COLES FLAT COLLAYOMI VALLEY COLLINS VALLEY CONEJO COPPER MOUNTAIN VALLEY COSO VALLEY COTTONEVA CREEK VALLEY COTTONWOOD SPRING AREA COTTONWOOD VALLEY COVELO ROUND VALLEY COW HEAD LAKE VALLEY COYOTE LAKE VALLEY COYOTE VALLEY COYOTE WELLS VALLEY CRONISE VALLEY CUDDEBACK VALLEY CUDDY CANYON VALLEY CUDDY RANCH AREA CUDDY VALLEY CUMMINGS VALLEY CUYAMA VALLEY DALE VALLEY DARWIN VALLEY DAVIES VALLEY DEADMAN VALLEY DEATH VALLEY DEEP SPRINGS VALLEY DENNING SPRING VALLEY DINSMORES TOWN AREA DIXIE VALLEY DOWNTOWN DRY BURNEY CREEK VALLEY DRY LAKE VALLEY DRY VALLEY EAGLE LAKE AREA EAST SALTON SEA EDEN VALLEY EEL RIVER VALLEY EGG LAKE VALLEY EL CAJON VALLEY EL MIRAGE VALLEY ELK CREEK AREA ELSINORE ESCONDIDO VALLEY EUREKA PLAIN EUREKA VALLEY FAIRCHILD SWAMP VALLEY FALL RIVER VALLEY FELTON AREA FENNER VALLEY FISH LAKE VALLEY FOOTHILL FORT BRAGG TERRACE AREA FORT ROSS TERRACE DEPOSITS FREMONT VALLEY FUNKS CREEK GARBERVILLE TOWN AREA GARCIA RIVER VALLEY GILROY-HOLLISTER VALLEY GOLD VALLEY GOLDSTONE VALLEY GOLETA GOOSE LAKE GOOSE VALLEY GRASS VALLEY GRASSHOPPER VALLEY GRAVELLY VALLEY GRAYS VALLEY GREENWATER VALLEY GRIZZLY VALLEY HALF MOON BAY TERRACE HAPPY CAMP TOWN AREA HARPER VALLEY HARRISBURG FLATS HARVEY VALLEY HAYFORK VALLEY HELENDALE FAULT VALLEY HEMET LAKE VALLEY HERNANDEZ VALLEY HETTENSHAW VALLEY HEXIE MOUNTAIN AREA HIDDEN VALLEY HIGH VALLEY HONEY LAKE VALLEY HONEYDEW TOWN AREA HOOPA VALLEY HORSE LAKE VALLEY HOT SPRINGS VALLEY HUASNA VALLEY HUMBUG VALLEY HUNGRY VALLEY HYAMPOM VALLEY IMPERIAL VALLEY INDIAN VALLEY INDIAN WELLS VALLEY IRON RIDGE AREA ISLAIS VALLEY IVANPAH VALLEY JACUMBA VALLEY JESS VALLEY JOHNSON VALLEY JOSEPH CREEK JOSHUA TREE KANE WASH AREA KELSO LANDER VALLEY KELSO VALLEY KENWOOD VALLEY KERN RIVER VALLEY KLAMATH RIVER VALLEY KNIGHTS VALLEY LAKE ALMANOR VALLEY LAKE BRITTON AREA LANFAIR VALLEY LANGFORD VALLEY LARABEE VALLEY LAS POSAS VALLEY LAST CHANCE CREEK VALLEY LAVIC VALLEY LAYTONVILLE VALLEY LEACH VALLEY LEE FLAT LITTLE ANTELOPE VALLEY LITTLE INDIAN VALLEY LITTLE LAKE VALLEY LITTLE VALLEY LIVERMORE VALLEY LOBOS LOCKWOOD VALLEY LONG VALLEY LOS BANOS CREEK VALLEY LOS OSOS VALLEY LOST HORSE VALLEY LOST LAKE VALLEY LOWER KINGSTON VALLEY LOWER KLAMATH RIVER VALLEY LOWER LAKE VALLEY LOWER LAYTONVILLE VALLEY LOWER MOJAVE RIVER VALLEY LOWER RUSSIAN RIVER VALLEY LUCERNE VALLEY MAD RIVER VALLEY MADELINE PLAINS MAJORS CREEK MALIBU VALLEY MARBLE CANYON AREA MARINA MARTIS VALLEY MASON VALLEY MATTOLE RIVER VALLEY MCCLOUD AREA MEADOW VALLEY MEANS VALLEY MESQUITE VALLEY MIDDLE AMARGOSA VALLEY MIDDLE CREEK MIDDLE FORK FEATHER RIVER MIDDLE MOJAVE RIVER VALLEY MIDDLE PARK CANYON MIL POTRERO AREA MISSION VALLEY MOHAWK VALLEY MONO VALLEY MONTECITO MORONGO VALLEY MORRO VALLEY MOUNTAIN MEADOWS VALLEY McDOWELL VALLEY NAPA-SONOMA VALLEY NAVARRO RIVER VALLEY NEEDLE ROCK POINT NEEDLES VALLEY NORTH FORK BATTLE CREEK NORTH FORK CACHE CREEK NOVATO VALLEY OCOTILLO-CLARK VALLEY OGILBY VALLEY OJAI VALLEY OLD VALLEY OLYMPIC VALLEY OROCOPIA VALLEY OTAY VALLEY OWENS VALLEY OWL LAKE VALLEY PAHRUMP VALLEY PAINTERS FLAT PAJARO VALLEY PALO VERDE MESA PALO VERDE VALLEY PAMO VALLEY PANAMINT VALLEY PANOCHE VALLEY PEACH TREE VALLEY PEPPERWOOD TOWN AREA PESCADERO VALLEY PETALUMA VALLEY PILOT KNOB VALLEY PINE CREEK VALLEY PINTO VALLEY PIPES CANYON FAULT VALLEY PITTSBURG PLAIN PIUTE VALLEY PLEASANT VALLEY PONDOSA TOWN AREA POPE VALLEY POTRERO VALLEY POTTER VALLEY POWAY VALLEY POZO VALLEY PRAIRIE CREEK AREA QUIEN SABE POINT VALLEY QUIEN SABE VALLEY RACE TRACK VALLEY RAFAEL VALLEY RANCHITA TOWN AREA RAYMOND RED PASS VALLEY RED ROCK VALLEY REDDING AREA REDWOOD CREEK AREA RHODES HILL AREA RICE VALLEY RIGGS VALLEY RINCONADA VALLEY ROCK PRAIRIE VALLEY ROSE VALLEY ROSS VALLEY ROUND VALLEY RUSSELL VALLEY SACRAMENTO VALLEY SALINAS VALLEY SALINE VALLEY SALT WELLS VALLEY SAN ANTONIO CREEK VALLEY SAN BENITO RIVER VALLEY SAN CARPOFORO VALLEY SAN DIEGO RIVER VALLEY SAN DIEGUITO CREEK SAN ELIJO VALLEY SAN FELIPE VALLEY SAN FERNANDO VALLEY SAN GABRIEL VALLEY SAN GREGORIO VALLEY SAN JACINTO SAN JOAQUIN VALLEY SAN JUAN VALLEY SAN LUIS OBISPO VALLEY SAN LUIS REY VALLEY SAN MARCOS AREA SAN MATEO VALLEY SAN ONOFRE VALLEY SAN PASQUAL VALLEY SAN PEDRO VALLEY SAN RAFAEL VALLEY SAN RAMON VALLEY SAN SIMEON VALLEY SAND POINT AREA SANEL VALLEY SANTA ANA VALLEY SANTA BARBARA SANTA CLARA RIVER VALLEY SANTA CLARA VALLEY SANTA CRUZ PURISIMA FORMATION SANTA MARGARITA VALLEY SANTA MARIA SANTA MARIA VALLEY SANTA ROSA FLAT SANTA ROSA VALLEY SANTA YNEZ RIVER VALLEY SCOTT RIVER VALLEY SCOTTS VALLEY SEARLES VALLEY SECRET VALLEY SEIAD VALLEY SEVEN OAKS VALLEY SHASTA VALLEY SHERWOOD VALLEY SIERRA VALLEY SILVER LAKE VALLEY SIMI VALLEY SLINKARD VALLEY SMITH RIVER PLAIN SODA LAKE VALLEY SOQUEL VALLEY SOUTH SAN FRANCISCO SPRING CANYON VALLEY SQUAW FLAT STONY GORGE RESERVOIR STONYFORD TOWN AREA SUISUN-FAIRFIELD VALLEY SUNOL VALLEY SUPERIOR VALLEY SURPRISE VALLEY SWEETWATER FLAT SWEETWATER VALLEY TAHOE VALLEY TEHACHAPI VALLEY EAST TEHACHAPI VALLEY WEST TEMECULA VALLEY TEN MILE RIVER VALLEY TERWILLIGER VALLEY THOUSAND OAKS AREA TIA JUANA TIERRA REJADA TOAD WELL AREA TORO VALLEY TRES PINOS VALLEY TULEDAD CANYON VALLEY TWENTYNINE PALMS VALLEY UKIAH VALLEY UPPER KINGSTON VALLEY UPPER LAKE VALLEY UPPER MOJAVE RIVER VALLEY UPPER OJAI VALLEY UPPER SANTA ANA VALLEY VALLECITO-CARRIZO VALLEY VALLECITOS CREEK VALLEY VANDEVENTER FLAT VENTURA RIVER VALLEY VIDAL VALLEY VILLA VALLEY VISITACION VALLEY WALKER BASIN CREEK VALLEY WARD VALLEY WARNER VALLEY WARREN VALLEY WEOTT TOWN AREA WEST SALTON SEA WEST SANTA CRUZ TERRACE WESTSIDE WILD HORSE MESA AREA WILDROSE CANYON WILLIAMS VALLEY WILLOW CREEK VALLEY WILSON GROVE FORMATION HIGHLANDS WILSON POINT AREA WINGATE VALLEY YAQUI WELL AREA YELLOW CREEK VALLEY YGNACIO VALLEY YOSEMITE VALLEY YUMA VALLEY USGS GAMA Prioritized Basins (65) 1: Prioirty Basin 2: Priority Basin 3: Priority Basin 4: Priority Basin 6: Low-Use Basins Groundwater Units (66) Groundwater Basin Highland area - Groundwater Basin Highland area - Province USGS Hyrogeological Provinces (15) Basin and Range Central Valley Desert Klamath Mountains Modoc Plateau and Cascades Northern Coast Ranges San Diego Sierra Nevada Southern Cal Islands (Group) Southern Coast Ranges Transverse and Selected Peninsular Range Cummulative Percent of Households with a Domestic Well (14) 1 (up to 50%) 2 (50 to 75%) 3 (75-90%) 4 (90-95%) 5 (>95%) 6 (no households) Geologic Map (68) alluvium andesite anorthosite argillite basalt blueschist chert conglomerate dacite diorite dolostone (dolomite) dune sand felsic volcanic rock gabbro glacial drift gneiss granite granodiorite greenschist greenstone hornfels intermediate volcanic rock landslide limestone mafic volcanic rock marble melange metasedimentary rock metavolcanic rock mica schist mudstone orthoquartzite pelitic schist peraluminous granite peridotite phyllite plutonic rock (phaneritic) quartz diorite quartz monzonite quartzite rhyolite sand sandstone schist serpentinite shale siltstone slate tephrite (basanite) tonalite trachybasalt water HUC 12 Boundaries (70) Closed Basin Frontal Island Multiple Outlet Standard Unknown Water