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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 Discrete water samples data are undergoing modernization with this page no longer being updated with the latest data starting March 11, 2024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 -- 236 sites found


Hydrologic unit = 18070103
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 Ventura County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11105850 ARROYO SIMI NR SIMI CA 1968-09-23 1978-03-21 42
USGS 11106550 CALLEGUAS C NR CAMARILLO CA 1969-01-20 2015-04-22 400
USGS 340544119062901 001S021W08L003S 1989-10-19 1993-09-21 10
USGS 340544119062902 001S021W08L004S 1989-10-19 2007-05-10 14
USGS 340650119080201 001S022W01H001S 1990-10-31 1992-01-22 3
USGS 340650119080202 001S022W01H002S 1990-11-01 1992-01-22 4
USGS 340650119080203 001S022W01H003S 1990-11-01 1993-09-21 5
USGS 340650119080204 001S022W01H004S 1990-11-01 1993-09-21 8
USGS 340700119070001 001N021W31A002S 2007-05-07 2007-05-07 3
USGS 340707119061301 001N021W32Q001S 1991-03-12 1991-03-12 1
USGS 340711119061201 DRAIN 001N021W32-1 S 1991-06-19 1991-06-19 1
USGS 340712119062001 001N021W32Q002S 1991-06-25 2007-05-09 7
USGS 340712119062002 001N021W32Q003S 1991-06-25 1991-08-07 2
USGS 340712119062003 001N021W32Q004S 1991-06-25 2007-05-09 5
USGS 340712119062004 001N021W32Q005S 1991-06-25 1993-09-21 7
USGS 340712119062005 001N021W32Q006S 1991-06-26 1993-09-21 7
USGS 340712119062006 001N021W32Q007S 1991-06-25 1993-09-21 7
USGS 340727119075601 001N022W36K005S 1990-09-25 2007-05-08 9
USGS 340727119075602 001N022W36K006S 1990-09-25 2002-07-18 6
USGS 340727119075603 001N022W36K007S 1990-09-25 2002-07-17 5
USGS 340727119075604 001N022W36K008S 1990-09-25 2002-07-24 10
USGS 340727119075605 001N022W36K009S 1990-09-25 2002-07-24 11
USGS 340728119095701 001N022W27R001S 1993-06-22 1993-06-22 1
USGS 340729119062701 001N021W32L001S 1991-03-12 1991-03-12 1
USGS 340729119072101 001N021W31L001S 1991-04-05 1991-04-05 1
USGS 340729119075401 001N022W36K004S 1990-01-11 2002-07-18 4
USGS 340730119074701 001N022W36J003S 1990-01-11 2007-05-08 4
USGS 340730119080901 001N022W36L001S 1990-08-21 1990-08-21 1
USGS 340732119093801 001N022W35E001S 1990-03-20 1992-04-29 3
USGS 340732119093802 001N022W35E002S 1990-03-20 1992-04-29 3
USGS 340732119093803 001N022W35E003S 1990-03-21 1992-04-29 3
USGS 340732119093804 001N022W35E004S 1990-03-21 1993-09-22 8
USGS 340732119093805 001N022W35E005S 1990-03-21 1993-09-22 8
USGS 340738119061401 001N021W32G004S 1990-08-22 1990-08-22 1
USGS 340756119044201 SUMP 001N021W33-1 S 1990-07-11 1990-07-11 1
USGS 340800119095901 001N022W27R003S 1990-11-01 1993-09-22 8
USGS 340800119095902 001N022W27R004S 1990-11-01 1993-09-22 9
USGS 340800119095903 001N022W27R005S 1990-11-01 1993-09-22 8
USGS 340812119053301 001N021W28M001S 1991-03-11 2007-05-16 4
USGS 340813119024801 001N021W06COMPOSITE 1992-11-12 1992-11-12 1
USGS 340820119103401 001N022W23Q002S 1991-07-10 1991-07-10 1
USGS 340821119080701 001N022W25K001S 1990-08-14 1990-08-14 1
USGS 340821119085701 001N022W26J003S 1990-10-29 1993-09-22 6
USGS 340821119085702 001N022W26J004S 1990-09-28 1993-09-22 11
USGS 340821119085703 001N022W26J005S 1990-09-28 1993-09-22 7
USGS 340827119110901 001N022W28G001S 1989-12-13 1991-05-15 4
USGS 340827119110902 001N022W28G002S 1989-12-14 1991-05-15 5
USGS 340827119110903 001N022W28G003S 1989-12-14 1991-05-14 5
USGS 340827119110904 001N022W28G004S 1989-12-14 1993-09-30 10
USGS 340827119110905 001N022W28G005S 1989-12-14 1993-09-30 10
USGS 340829119050901 SUMP 001N021W28-1 S 1990-09-06 1990-09-06 1
USGS 340842119054301 001N021W28D001S 1991-03-12 2002-07-17 7
USGS 340845119125401 001N022W29D001S 1989-11-12 1993-08-20 9
USGS 340845119125402 001N022W29D002S 1989-11-14 1994-05-04 26
USGS 340845119125403 001N022W29D003S 1989-11-12 1993-08-20 13
USGS 340845119125404 001N022W29D004S 1989-11-14 1993-08-20 11
USGS 340848119102601 001N022W27C002S 1990-10-30 1993-09-22 7
USGS 340848119102602 001N022W27C003S 1990-10-30 1993-09-22 10
USGS 340848119102603 001N022W27C004S 1990-10-31 1993-09-22 7
USGS 340850119111001 001N022W28B001S 1991-11-04 1991-11-04 1
USGS 340851119094001 001N022W23N002S 1991-10-28 1991-10-28 1
USGS 340853119090601 001N022W27L001S 1991-07-10 1991-07-10 1
USGS 340903119101601 001N022W22K001S 1991-10-07 1991-10-07 1
USGS 340907119055801 001N022W22J012S 1990-07-23 1990-07-23 1
USGS 340907119125201 001N022W20M001S 1991-11-13 1993-08-18 6
USGS 340907119125202 001N022W20M002S 1991-11-07 1994-05-03 12
USGS 340907119125203 001N022W20M003S 1991-11-06 1993-08-19 7
USGS 340907119125204 001N022W20M004S 1991-11-12 1993-09-30 9
USGS 340907119125301 001N022W20M005S 1991-11-07 1993-09-30 11
USGS 340907119125302 001N022W20M006S 1991-11-13 1993-09-30 9
USGS 340911119095601 001N022W22J007S 1990-07-25 1990-07-25 1
USGS 340911119095602 001N022W22J008S 1990-08-16 1990-08-16 1
USGS 340912119040901 001N021W22C001S 1991-03-12 2017-08-08 18
USGS 340913119073101 001N021W19L007S 1991-02-26 1991-02-26 1
USGS 340914119073301 001N021W19L010S 1991-06-12 1993-09-21 8
USGS 340914119073302 001N021W19L011S 1991-06-12 1993-09-21 8
USGS 340914119073303 001N021W19L012S 1991-06-12 1993-09-21 10
USGS 340914119073304 001N021W19L013S 1991-06-12 1993-09-21 8
USGS 340914119073305 001N021W19L014S 1991-06-13 1993-09-21 8
USGS 340914119113401 001N022W21L005S 1990-08-21 1990-08-21 1
USGS 340915119071301 001N021W19K010S 1990-08-15 1990-08-15 1
USGS 340915119073101 DRAIN 001N021W19-1 S 1991-05-21 1991-05-21 1
USGS 340916119045001 001N021W21H002S 1991-02-27 2002-07-15 6
USGS 340916119120901 001N022W20J004S 1991-05-30 1993-08-17 6
USGS 340916119120902 001N022W20J005S 1991-05-30 1993-08-18 6
USGS 340916119120903 001N022W20J006S 1991-05-30 1993-09-30 10
USGS 340916119120904 001N022W20J007S 1991-05-30 1993-09-30 9
USGS 340916119120905 001N022W20J008S 1991-05-31 1993-09-30 12
USGS 340918119073601 001N022W24H001S 1990-08-14 1990-08-14 1
USGS 340923119095501 001N022W22H001S 1993-09-16 1993-09-16 1
USGS 340929119085001 001N022W23A004S 1993-09-20 1993-09-20 1
USGS 340932119111101 001N022W21B006S 1990-12-13 2017-08-10 6
USGS 340932119130501 001N022W19A001S 2007-04-05 2007-04-05 3
USGS 340937119072801 001N021W19C001S 1990-08-15 1990-08-15 1
USGS 340937119080301 001N022W24B002S 1991-11-04 1991-11-04 1
USGS 340938119111301 001N022W21B003S 1990-12-13 1991-02-28 2
USGS 341003119034701 001N021W15J004S 1991-02-26 1991-08-08 2
USGS 341007119042101 001N021W15L002S 1991-08-08 1991-08-08 1
USGS 341018119034701 001N021W15H001S 1990-08-22 1990-08-22 1
USGS 341019119115501 001N022W16E001S 1993-09-13 1993-09-13 1
USGS 341026119126001 001N022W17D002S 1990-08-21 1990-08-21 1
USGS 341032118530801 001N019W17A001S 1979-06-02 1979-08-15 2
USGS 341032119042501 001N021W15D002S 1991-03-12 2002-06-18 9
USGS 341032119082701 001N022W13D003S 1991-08-06 1991-08-06 1
USGS 341034119054501 001N021W08R001S 1991-02-27 2017-06-27 35
USGS 341046119030801 001N021W11P001S 1991-02-26 1991-08-07 2
USGS 341047119023601 CALLEGUAS C A LEWIS RD CA 1990-07-11 1990-07-11 1
USGS 341048119065001 001N021W07J002S 1991-02-20 2017-06-29 9
USGS 341059119040601 001N021W10G001S 1991-03-12 2002-06-19 10
USGS 341120119092401 001N022W11C003S 2017-08-09 2017-08-09 5
USGS 341123119100401 001N022W10B003S 1977-10-13 1978-09-07 4
USGS 341128119034101 001N021W03R001S 1991-03-12 2017-06-26 8
USGS 341129119011201 001N020W06P002S 1991-08-28 1991-08-28 1
USGS 341137118530501 001N019W04N001S 1979-06-23 1979-08-16 2
USGS 341141119054501 001N021W05J002S 1991-07-25 1991-07-25 1
USGS 341142119082601 001N022W01M003S 1991-08-06 2017-06-28 5
USGS 341143119064801 001N021W06J005S 1991-02-21 2017-06-28 9
USGS 341145119034601 001N021W03J001S 1991-08-07 1991-08-07 1
USGS 341146119045701 001N021W04K001S 1991-02-27 2017-06-27 7
USGS 341148119040601 001N021W03K001S 1991-02-27 2002-07-16 8
USGS 341149119060901 001N021W05K001S 1991-07-24 1991-07-24 1
USGS 341200119130001 002N022W31B003S 2007-05-16 2007-05-16 3
USGS 341202119102901 001N022W03F001S 1977-10-13 1978-09-07 4
USGS 341202119103001 001N022W03F009S 1996-08-07 1996-08-07 1
USGS 341203119103101 001N022W03F004S 1996-08-13 1996-08-13 1
USGS 341204119103001 001N022W03F008S 1996-08-13 2011-04-26 7
USGS 341205119102801 001N022W03F002S 1996-08-13 1996-08-13 1
USGS 341205119102901 001N022W03F010S 1996-08-07 1996-08-07 1
USGS 341205119103101 001N022W03F011S 1996-08-07 1996-08-07 1
USGS 341206119054101 001N021W04D004S 1991-02-27 1991-08-05 2
USGS 341207118512001 001N019W03G001S 1979-06-22 1979-08-28 2
USGS 341209119132801 001N022W06B001S 1991-07-24 1991-07-24 1
USGS 341215119145501 001N023W01C002S 1989-12-12 1992-01-09 3
USGS 341215119145502 001N023W01C003S 1989-12-15 1992-01-07 4
USGS 341215119145503 001N023W01C004S 1989-12-15 1992-01-07 4
USGS 341215119145504 001N023W01C005S 1989-12-15 1992-01-07 4
USGS 341217119015701 001N021W01B004S 1990-08-23 1990-08-23 1
USGS 341217119020201 001N021W01C002S 2002-07-18 2007-04-18 4
USGS 341218119010401 001N020W06C001S 2002-07-19 2002-07-19 1
USGS 341244119113901 002N022W33M002S 1991-02-27 1991-02-27 1
USGS 341245118592201 CONEJO C A ADOLFO RD CA 1990-07-10 1990-07-10 1
USGS 341246119040201 002N021W34G002S 1990-08-03 2002-07-25 5
USGS 341246119040202 002N021W34G003S 1990-08-03 2017-07-14 9
USGS 341246119040203 002N021W34G004S 1990-08-03 2002-07-26 5
USGS 341246119040204 002N021W34G005S 1990-08-03 2002-07-27 5
USGS 341246119040205 002N021W34G006S 1992-05-15 2002-07-27 3
USGS 341246119040601 002N021W34G001S 1990-08-03 2007-06-07 63
USGS 341253119014601 002N021W36G003S 1991-08-07 1991-08-07 1
USGS 341259119063301 002N021W32E001S 1991-02-20 2017-06-29 6
USGS 341259119083901 002N022W36E008S 2017-07-13 2017-07-13 4
USGS 341259119083902 002N022W36E007S 2017-07-03 2017-07-03 4
USGS 341300119040001 002N021W34C001S 2007-04-04 2022-03-14 8
USGS 341300119080001 002N022W25L002S 2007-04-03 2017-08-08 8
USGS 341308119134501 002N022W31C002S 1993-04-07 1993-04-07 1
USGS 341309119005601 002N020W31B001S 1990-07-25 1990-07-25 1
USGS 341309119123801 002N022W32C001S 1993-04-07 1993-04-07 1
USGS 341321119132901 002N022W30Q001S 1991-07-24 1993-04-07 2
USGS 341322119080601 002N022W25Q003S 1991-03-01 1992-06-19 2
USGS 341334118554501 ARROYO CONEJO A HILL CYN CA 1990-07-10 1990-07-10 1
USGS 341400118550001 002N020W25C002S 2007-04-09 2017-07-12 4
USGS 341400118590001 002N020W29B002S 2007-04-09 2022-03-28 4
USGS 341402119091401 002N022W26C003S 1990-07-12 1992-06-19 3
USGS 341406118561201 002N020W23R001S 1952-07-22 1977-10-14 5
USGS 341408119074201 002N022W24R001S 1991-07-24 1991-07-24 1
USGS 341414119074401 002N022W24R002S 1991-02-25 1991-02-25 1
USGS 341419119081401 002N022W24P002S 1991-02-25 1991-02-25 1
USGS 341433118564201 002N020W23G003S 1991-09-04 1991-09-04 1
USGS 341438119010501 002N020W19F004S 1991-08-07 2007-04-10 4
USGS 341439119062801 002N021W20F002S 1991-02-20 1991-02-20 1
USGS 341444119085301 002N022W23H004S 1990-07-12 1991-08-06 3
USGS 341445119070601 002N021W19B002S 1991-03-01 1991-03-01 1
USGS 341457119064901 002N021W19A001S 1991-07-25 1991-07-25 1
USGS 341500118510001 002N019W15N003S 2007-04-09 2022-03-29 4
USGS 341502119083301 002N022W13N002S 1991-02-25 1991-08-07 2
USGS 341506119070601 002N021W18Q001S 1991-07-25 1991-07-25 1
USGS 341517119043501 BEARDSLEY WASH A WALNUT AVE CA 1990-07-23 1990-07-23 1
USGS 341520119043001 002N021W15M004S 1990-08-24 1992-07-21 2
USGS 341532119064601 002N021W18H003S 1991-02-27 1993-04-30 2
USGS 341532119064801 002N021W18H012S 1991-02-27 1993-04-30 2
USGS 341533119065001 002N021W18H005S 1991-03-27 1993-04-30 2
USGS 341539118584001 002N020W16B003S 1991-06-25 1991-08-08 2
USGS 341546119003201 002N020W18A001S 1990-06-12 1990-06-12 1
USGS 341549118583801 002N020W16A002S 1990-12-06 1991-09-04 2
USGS 341549118583802 002N020W16A003S 1990-12-06 1991-09-05 2
USGS 341549118583803 002N020W16A004S 1990-11-02 1991-09-04 2
USGS 341554118562601 002N020W11R002S 1991-07-19 1991-07-19 1
USGS 341554118582701 002N020W09R001S 1990-05-22 1990-05-22 1
USGS 341557119071801 002N021W07P003S 1991-02-25 1991-02-25 1
USGS 341600118470001 002N018W08D004S 2007-04-18 2017-07-12 7
USGS 341600118470002 002N018W08K007S 2007-04-19 2007-04-19 3
USGS 341600118590001 002N020W08B001S 2007-04-12 2007-04-12 3
USGS 341600119060001 002N021W08L002S 2007-04-16 2007-04-16 3
USGS 341600119070001 002N022W12J004S 2007-04-11 2007-04-11 3
USGS 341602119073101 002N021W07M003S 1991-02-25 1991-02-25 1
USGS 341607119023301 002N021W11J003S 1991-08-27 1992-07-21 2
USGS 341607119023303 002N021W11J005S 1991-02-08 1991-08-20 2
USGS 341608119072901 002N021W07L003S 1990-09-27 1992-05-12 5
USGS 341608119072902 002N021W07L004S 1990-09-27 1992-05-12 5
USGS 341608119072903 002N021W07L005S 1990-09-27 1992-05-12 5
USGS 341608119072904 002N021W07L006S 1991-04-03 2017-07-10 7
USGS 341617119010001 002N020W07L001S 1992-07-23 1992-08-11 2
USGS 341618118552201 ARROYO SIMI A HITCH RD CA 1990-05-23 1993-09-01 3
USGS 341619119023201 002N021W11H002S 1992-08-11 1992-08-11 1
USGS 341620118464001 002N018W09E001S 1990-09-05 1990-09-05 1
USGS 341621118531601 002N019W08G001S 1990-06-12 1990-06-12 1
USGS 341622119000401 002N020W08F001S 1990-05-24 1990-05-24 1
USGS 341631119053401 002N021W09D002S 1993-04-30 1993-04-30 1
USGS 341632118470201 002N018W08B004S 1990-05-23 1990-05-23 1
USGS 341637118522601 ARROYO SIMI AT MOORPARK RD CA 1993-09-01 1993-09-01 1
USGS 341640118474502 ARROYO SIMI AT MADERA RD BRIDGE NR SIMI CA 1993-09-02 1993-09-02 1
USGS 341640118544301 002N019W07C001S 1993-07-21 1993-07-21 1
USGS 341640119074301 002N022W12A002S 1973-06-12 1976-07-02 2
USGS 341647119003501 002N020W06R001S 1992-07-08 1992-07-08 1
USGS 341652118550101 002N019W06N003S 1993-07-20 1993-07-20 1
USGS 341652118553101 002N020W01Q001S 1993-07-22 1993-07-22 1
USGS 341657118483801 ARROYO SIMI UPST WWTP CA 1990-05-23 1993-08-31 3
USGS 341657118484101 SIMI VALLEY WWTP CA 1990-05-23 1993-08-31 3
USGS 341657118570801 002N020W02N003S 1993-07-20 1993-07-20 1
USGS 341710118585401 002N020W04F002S 1992-07-09 1992-08-10 2
USGS 341711118544301 002N019W06F001S 1993-07-22 1993-07-22 1
USGS 341713118590001 002N020W04F001S 1992-07-09 1992-07-09 1
USGS 341720118554401 002N020W01C001S 1996-06-04 1996-07-02 14
USGS 341723118554101 002N020W01B003S 1996-08-12 1996-08-12 7
USGS 341723118554701 002N020W01F001S 1996-04-22 1996-04-22 9
USGS 341724118554401 002N020W01C002S 1996-07-02 1996-07-02 6
USGS 341733118505001 ARROYO SIMI AT LOS ANGELES AVENUE CA 1993-09-02 1993-09-02 1
USGS 341745118561601 003N020W35R002S 1991-02-06 1992-07-22 2
USGS 341745118561602 003N020W35R003S 1991-02-07 1991-04-02 24
USGS 341745118561603 003N020W35R004S 1991-08-21 1992-07-23 2
USGS 341745118561701 003N020W35R001S 1991-03-14 2007-04-12 5
USGS 341800118550001 003N020W36G001S 2007-04-12 2022-03-29 5
USGS 341806119033601 003N021W34A001S 1991-08-27 1991-08-27 1
USGS 341831118524401 003N019W28N001S 1992-07-10 1992-07-10 1
USGS 341832118562501 003N020W26R003S 1993-07-21 1993-07-21 1
USGS 341932118552401 003N020W24J001S 1993-07-19 1993-07-19 1
USGS 342337118562401 SESPE C A ROUTE 126 CA 1991-09-30 1993-10-27 6