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Water Quality Samples for USA
Grouped by County

! Discrete water samples data are undergoing modernization with this page no longer being updated with the latest data starting March 11, 2024
with a full decommission expected 6 months later. Learn more about the upcoming change and where to find the new samples data in our blog.
Some complex retrievals may take a few minutes.

Site Selection Results -- 116 sites found


Hydrologic unit = 18050001
Minimum number of samples = 1

Save file of selected sites to local disk for future upload

Data for individual sites can be obtained by selecting the site number below

  group icon Contra Costa County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11182400 ARROYO DEL HAMBRE A MARTINEZ CA 1970-11-28 2017-05-15 32
USGS 11182450 CARQUINEZ STRAIT A MARTINEZ CA 2024-01-10 2024-01-10 1
USGS 11182500 SAN RAMON C A SAN RAMON CA 2017-04-05 2017-05-13 21
USGS 11183000 SAN RAMON C AT WALNUT CREEK CA 1977-08-11 1977-08-11 1
USGS 11183600 WALNUT C A CONCORD CA 1970-11-28 1988-08-09 10
USGS 11183670 WALNUT C A DIAMOND BLVD BRIDGE NR CONCORD CA 2021-11-04 2022-05-19 72
USGS 11185185 SUISUN BAY A MALLARD IS CA 1998-10-08 2023-09-22 602
USGS 374805121553601 001S001W36L001M 1981-03-30 1981-09-16 2
USGS 374806121553603 001S001W36L003M 1981-03-30 1981-03-30 1
USGS 374933122001301 SAN RAMON C A LA GONDA WAY A DANVILLE CA 2017-04-05 2017-05-13 22
USGS 375257122050001 LAS TRAMPAS C A LAFAYETTE CA 2017-04-04 2017-05-16 22
USGS 375413122033301 WALNUT C A CIVIC DR A WALNUT CREEK CA 2017-04-05 2017-05-16 22
USGS 375625122032501 001N002W11N001M 1973-08-03 1977-07-19 3
USGS 375701121564401 MT DIABLO C A CLAYTON CA 2017-04-06 2017-05-15 23
USGS 375819122035801 GRAYSON C A GOLF CLUB RD NR PLEASANT HILL CA 2017-04-06 2017-05-15 23
USGS 380044121510301 002N001E22C001M 1971-10-28 1982-09-23 35
USGS 380045122031701 002N002W14P002M 1970-10-29 1982-09-24 49
USGS 380049122015301 002N002W13P001M 1970-10-29 1982-09-24 49
USGS 380104121530001 002N001E17K002M 1981-09-17 1982-09-23 2
USGS 380107121530201 002N001E17K001M 1970-10-29 1976-04-13 31
USGS 380123122015401 002N002W13B005M 1970-10-29 1982-09-24 46
USGS 380124122014201 002N002W13B003M 1970-10-29 1982-09-24 34
USGS 380124122014701 002N002W13B004M 1971-06-23 1982-04-28 20
USGS 380127122012900 CONTRA COSTA CN DIV A CLYDE CA 2001-03-27 2001-08-21 5
USGS 380127122012909 BOLLMAN WTP FINISHED WATER A CLYDE CA 2001-03-13 2001-08-21 5
USGS 380129121543901 002N001E18D001M 1970-10-29 1982-09-23 54
USGS 380131121543101 002N001E18C001M 1980-09-25 1980-09-25 1
USGS 380138121552501 002N001W12P003M 1972-12-19 1973-10-02 6
USGS 380138121552601 002N001W12P001M 1972-12-19 1973-10-02 6
USGS 380140121535501 002N001E07R002M 1971-01-20 1979-09-24 30
USGS 380140121552501 002N001W12P002M 1974-03-12 1974-03-12 1
USGS 380141121540001 002N001E07R004M 1974-09-25 1977-09-14 9
USGS 380141121540601 002N001E07R003M 1971-04-15 1973-10-02 14
USGS 380141121552501 002N001W12P004M 1970-10-29 1978-09-27 37
USGS 380148122090601 SAN FRANCISCO BAY A MARTINEZ CA 1977-11-10 2024-02-01 11
USGS 380215121522201 BROWNS ISLAND SLOUGH NR PITTSBURG CA 2020-09-25 2020-09-25 1
USGS 380216121521801 BROWNS ISLAND SIDE SLOUGH NR PITTSBURG CA 2018-10-17 2018-10-17 1
USGS 380216121573801 002N001W10C001M 1972-06-20 1982-09-23 29
USGS 380221121590801 002N001W09D002M 1972-04-28 1978-09-28 18
USGS 380226121591201 002N001W09D001M 1971-01-25 1982-09-24 45
USGS 380232121521601 BROWNS ISLAND MAIN SLOUGH NR PITTSBURG CA 2018-07-26 2018-07-26 1
USGS 380239121583801 002N001W04Q001M 1971-01-27 1982-04-28 44
USGS 380254121522301 SUISUN BAY A BROWNS ISLAND NR PITTSBURG CA 2020-09-25 2020-09-25 1
USGS 380254121560601 SAN FRANCISCO BAY A SIMMONS PT CA 1977-11-10 1978-11-09 9
USGS 380254122054801 SAN FRANCISCO BAY A AVON CA 1977-11-10 2018-10-17 10
USGS 380337122000301 SUISUN BAY A BUOY 19 NR PORT CHICAGO CA 2022-04-18 2023-10-18 10
USGS 380348121511801 SAN FRANCISCO BAY A CHAIN ISLAND CA 1977-11-10 2020-10-22 13
USGS 380817121520101 003N001E14B002M 1971-01-25 1972-02-22 17
USGS 380917121582601 004N001W33A001M 1971-01-25 1972-02-22 15
USGS 381129122075001 004N002W18M001M 1971-03-05 1971-06-21 6
USGS 381230122045601 004N002W09H001M 1971-03-24 1971-06-21 5
USGS 381235121531701 004N001E08F001M 1971-01-25 1971-06-22 7
USGS 381302122062501 004N002W05Q002M 1971-03-05 1971-08-24 7
USGS 381342122055701 004N002W04D001M 1971-03-05 1971-06-21 6
USGS 381348122041402 005N002W34P004M 1971-03-05 1971-06-21 6
USGS 381438121585501 005N001W28P001M 1971-03-24 1971-06-22 5
USGS 381443121550301 005N001W25R001M 1971-03-04 1971-06-22 6
  group icon Napa County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 381908122113001 006N003W33J001M 2004-10-06 2004-10-06 3
USGS 382041122122801 LOWER LEONA LK SITE LL NR NAPA CA 2002-01-15 2002-01-15 1
  group icon San Joaquin County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 380530121511301 003N001E22F001M 1971-01-25 1972-03-21 17
  group icon Solano County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11455508 SUISUN BAY A VAN SICKLE ISLAND NR PITTSBURG CA 2015-09-14 2024-03-05 115
USGS 11455530 SIMMONS POINT A CHIPPS ISLAND NR HONKER BAY 2018-07-26 2018-10-17 2
USGS 11455580 ALONZO DR A CORDELIA RD NR FAIRFIELD CA 1970-06-15 1975-06-10 20
USGS 11455600 RAINES CR A CHADBOURNE RD NR FAIRFIELD CA 1970-06-15 1975-06-10 18
USGS 11455760 SUISUN BAY NR CONCORD NAVAL WEAPONS STATION 2018-10-17 2018-10-17 1
USGS 11455780 SUISUN BAY A BENICIA BRIDGE NR BENICIA CA 2001-10-11 2022-01-11 455
USGS 380200122082701 SUISUN BAY AT MARTINEZ C 1993-02-12 1993-02-16 5
USGS 380256121545601 SUISUN BAY NR SIMMONS POINT A CHIPPS ISLAND CA 2011-11-22 2012-01-06 6
USGS 380259121550302 CHIPPS ISLAND (LOWER REC BOTTOM) CA 2018-10-17 2018-10-17 1
USGS 380300121524201 SAN FRANCISCO BAY A PITTSBURG CA 1977-11-10 1978-11-09 26
USGS 380300122102401 SAN FRANCISCO BAY A BENICIA CA 1977-11-10 1978-11-09 34
USGS 380306121524801 SAN FRANCISCO BAY WATER QUALITY PROJECT SITE 3 2024-02-01 2024-02-01 1
USGS 380315122063301 SUISUN BAY NR AVON CA 2019-06-04 2019-06-04 1
USGS 380318121571501 SUISUN BAY A CHANNEL MARKER 24A NR BAY POINT CA 2023-07-25 2023-07-25 8
USGS 380318122062601 SUISUN BAY NR BENICIA CA 2022-04-18 2023-10-18 8
USGS 380336121584801 SAN FRANCISCO BAY A DUTTON ISLAND CA 1977-11-10 2018-10-17 11
USGS 380336122123001 SAN FRANCISCO BAY WATER QUALITY PROJECT SITE 10 2024-02-01 2024-02-01 1
USGS 380348121574401 SUISUN BAY NR BAY POINT CA 2020-09-25 2020-09-25 1
USGS 380354122020601 SAN FRANCISCO BAY A ROE ISLAND CA 1977-11-10 2024-02-01 45
USGS 380408121560801 HONKER BAY A WHEELER ISLAND A CHIPPS ISLAND CA 2011-11-22 2020-09-25 16
USGS 380414121580401 HONKER BAY A SNAG ISLAND NR MONTEZUMA CA 2016-05-20 2018-10-17 6
USGS 380424121555701 HONKER BAY NR MONTEZUMA CA 2022-04-18 2023-10-18 9
USGS 380437121545801 HONKER BAY A WHEELER ISLAND NR MONTEZUMA CA 2020-09-25 2020-09-25 1
USGS 380447122045401 SUISUN BAY NR GOODYEAR SLOUGH NR BENICIA CA 2011-11-22 2018-10-17 16
USGS 380502121594801 SUISUN CUTOFF A FREEMAN ISLAND MONTEZUMA CA 2018-07-27 2018-08-29 3
USGS 380521122013201 RYER ISLAND A SUISUN CUTOFF NR PORT CHICAGO CA 2020-09-01 2021-08-26 8
USGS 380525122003001 SUISUN BAY A SUISUN CUTOFF A SIMMONS ISLAND CA 2011-10-12 2018-10-17 14
USGS 380530122003501 SUISUN BAY A SUISUN CUTOFF A POINT BUCKLER CA 2011-11-22 2012-09-13 10
USGS 380536122013801 GRIZZLY BAY A SUISUN CUTOFF NR PORT CHICAGO CA 2020-09-01 2021-08-26 7
USGS 380545121532601 MONTEZUMA SLOUGH A GRIZZLY ISL RD A MONTEZUMA CA 2018-07-27 2018-09-20 4
USGS 380605122012101 GRIZZLY BAY A POINT BUCKLER CA 2011-10-07 2018-10-17 28
USGS 380631122032201 GRIZZLY BAY A SUISUN SLOUGH NR AVON CA 2017-10-03 2024-02-08 101
USGS 380701122022301 GRIZZLY BAY NR SUISUN SLOUGH CA 2011-04-05 2021-08-26 27
USGS 380708121515001 003N001E09H001M 1980-09-22 1980-09-22 1
USGS 380724121593001 GRIZZLY BAY NR SIMMONS ISLAND CA 2018-07-26 2018-07-26 2
USGS 380756122004201 GRIZZLY BAY A GRIZZLY ISLAND NR BIRD LANDING CA 2017-11-17 2023-10-18 25
USGS 380800121490001 003N001E02A001M 2005-03-31 2005-03-31 3
USGS 380831121491801 004N001E35R001M 1980-09-22 1980-09-22 1
USGS 380833122033401 MONTEZUMA SLOUGH AB GRIZZLY BAY NR CORDELIA CA 2018-08-23 2018-08-23 5
USGS 381002121560201 MONTEZUMA SLOUGH A NURSE SLOUGH NR BIRDS LANDING 2018-07-27 2018-09-20 4
USGS 381111121581601 MONTEZUMA SLOUGH AB CROSS SLOUGH NR FAIRFIELD CA 2018-07-27 2021-08-10 5
USGS 381126121554801 NURSE SLOUGH A BRADMOOR ISLAND NR BIRDS LANDING CA 2018-07-27 2018-09-20 4
USGS 381142122015801 FIRST MALLARD BRANCH NR FAIRFIELD CA 2017-12-12 2024-02-08 122
USGS 381158122015601 FIRST MALLARD BRANCH AB CUTOFF SLOUGH NR FAIRFIELD 2017-12-19 2017-12-19 1
USGS 381200121520001 004N001E09L001M 2005-05-12 2020-06-25 11
USGS 381218121524101 004N001E09M001M 1981-10-21 1981-10-21 1
USGS 381400122020001 005N001W28R001M 2005-04-20 2005-04-20 3
USGS 381441122064301 SUISUN C A ROCKVILLE CA 2017-04-06 2018-05-18 29
USGS 381543122052601 005N002W21P003M 1973-07-19 1977-07-12 3
USGS 381600122060001 005N002W20A001M 2005-05-12 2014-04-15 3
USGS 381632121573701 005N001W15P001M 1980-09-16 1980-09-16 1
USGS 381700121570001 005N001W10P001M 2005-05-17 2005-05-17 1
USGS 381703121555301 005N001W13D001M 1980-09-16 1980-09-16 1
USGS 381749122112101 LAKE FREY SITE LF NR NAPA CA 2002-01-15 2002-01-15 1
USGS 381829122113401 LAKE MADIGAN OUTFLOW SITE LMO NR NAPA CA 2002-01-15 2002-01-15 1
USGS 381829122113501 LAKE MADIGAN SITE LM NR NAPA CA 2002-01-15 2002-01-15 1