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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 Discrete water samples data are undergoing modernization with this page no longer being updated with the latest data starting March 11, 2024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 -- 85 sites found


Hydrologic unit = 18050006
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 San Francisco County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11162680 LAKE MERCED AT PUMPHOUSE 1987-11-17 1988-05-02 3
USGS 374200122290001 002S006W35G005M 2007-05-23 2007-05-23 3
USGS 374200122290002 002S006W35G004M 2007-05-22 2007-05-22 3
USGS 374200122290003 002S006W35G003M 2007-05-22 2007-05-22 3
USGS 374200122290004 002S006W35G002M 2007-05-21 2007-05-21 3
USGS 374235122283801 002S006W36N002M 1987-11-19 1991-01-09 4
USGS 374246122295403 002S006W34J003M 1989-12-05 1990-04-05 2
USGS 374325122282801 002S006W25N001M 1987-11-19 1988-05-03 3
USGS 374330122295601 LK MERCED A BOATHOUSE AT SAN FRANCISCO CA 1987-11-17 1989-08-31 4
USGS 374346122300501 002S006W27J001M 1987-11-18 1990-04-03 5
USGS 374406122301701 002S006W27B005M 1987-11-17 1991-01-09 2
USGS 374406122301702 002S006W27B006M 1988-03-01 1988-05-02 2
USGS 374407122302601 PACIFIC OCEAN A SLOAT AVE AT SAN FRANCISCO CA 1987-11-17 1987-11-17 1
USGS 374408122274501 002S006W25AS01M 1988-08-19 1989-08-31 4
USGS 374409122300701 002S006W27B001M 1988-02-29 1988-05-03 2
USGS 374409122301701 002S006W27B003M 1987-11-20 1988-05-02 3
USGS 374412122284901 002S006W26A002M 1987-11-17 1988-05-04 3
USGS 374424122301901 002S006W22Q001M 1987-11-20 1991-01-09 5
USGS 374436122300501 002S006W22J001M 1987-11-19 1988-05-03 3
USGS 374450122302401 002S006W22F001M 1987-11-19 1988-05-04 3
USGS 374500122300001 002S006W10P500M 2007-06-20 2022-04-07 5
USGS 374516122302701 002S006W15P001M 1987-11-18 1991-01-09 6
USGS 374519122300801 002S006W15K003M 1987-11-16 1987-11-16 1
USGS 374523122300901 002S006W15K001M 1988-03-02 1988-05-03 2
USGS 374530122302901 002S006W15F001M 1989-05-18 1989-05-18 1
USGS 374544122303001 002S006W15C001M 1987-11-18 1990-04-04 4
USGS 374553122302501 002S006W15C003M 1989-12-06 1989-12-06 1
USGS 374553122302502 002S006W15C004M 1989-12-04 1990-04-04 2
USGS 374553122302503 002S006W15C005M 1989-12-04 1990-04-04 2
USGS 374555122302801 002S006W15C002M 1988-03-02 1988-05-04 2
USGS 374604122284701 002S006W11R002M 1989-12-06 1991-01-10 3
USGS 374605122284801 002S006W11R001M 1988-03-02 2007-06-20 10
USGS 374616122303001 002S006W10L001M 1988-03-02 1989-05-19 4
USGS 374616122303002 002S006W10L002M 1988-03-02 1988-03-02 1
  group icon San Mateo County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11162500 PESCADERO C NR PESCADERO CA 1966-06-29 1993-05-11 235
USGS 11162540 BUTANO C NR PESCADERO CA 1970-11-12 1973-01-18 9
USGS 11162570 SAN GREGORIO C A SAN GREGORIO CA 1967-05-10 1993-04-28 142
USGS 11162600 PURISIMA C NR HALF MOON BAY CA 1977-08-29 2015-09-02 2
USGS 11162620 PILARCITOS C BL STONE DAM NR HILLSBOROUGH CA 2015-02-02 2017-05-23 7
USGS 11162630 PILARCITOS C A HALF MOON BAY CA 1990-06-13 1990-06-13 1
USGS 11162655 SAN PEDRO C A PACIFICA 1977-08-29 2015-09-02 2
USGS 370900122190001 009S004W08N001M 2011-03-29 2011-03-29 3
USGS 371300122140001 008S004W24R001M 2011-04-04 2011-04-04 3
USGS 371700122220001 007S005W27JS01M 2011-03-29 2011-03-29 3
USGS 371800122150001 007S004W24L001M 2011-05-02 2011-05-02 3
USGS 371900122230001 007S005W15C001M 2011-05-02 2011-05-02 3
USGS 372200122230001 006S005W27Q001M 2011-04-04 2011-04-04 3
USGS 373054122294101 005S006W11E001M 1981-08-05 1981-09-15 2
USGS 373300122290001 004S006W27R001M 2011-03-28 2021-06-14 7
USGS 373718122292701 SANCHEZ C A PACIFICA CA 2006-02-15 2006-07-12 6
USGS 373842122290301 MILAGRA C NR PACIFICA CA 2006-02-15 2006-07-12 6
USGS 374100122280001 003S006W01Q001M 2007-05-24 2007-05-24 3
USGS 374100122290001 003S006W02R001M 2007-05-24 2007-05-24 3
USGS 374211122285901 003S006W02H001M 1989-05-17 1989-05-17 1
USGS 374228122285301 003S006W02A001M 1989-12-07 1991-01-09 3
USGS 374230122291101 002S006W35Q001M 1989-12-06 1991-01-09 3
  group icon Santa Cruz County, California
Agency Site Number Site Name Period of Record
Begin Date End Date Samples
USGS 11161570 MAJORS C NR SANTA CRUZ CA 1977-08-18 2015-09-02 2
USGS 11161590 LAGUNA C NR DAVENPORT CA 1972-06-07 1977-08-18 2
USGS 11161800 SAN VICENTE C NR DAVENPORT CA 1977-08-26 1977-08-26 1
USGS 365700122035301 011S002W27B001M 1978-10-16 1983-08-04 35
USGS 365723122041701 011S002W22M001M 1978-10-16 1980-05-15 7
USGS 365727122041001 011S002W22M002M 1980-08-20 1983-09-12 32
USGS 365727122041701 011S002W22M003M 2013-01-10 2013-01-10 2
USGS 365727122053001 011S002W21E001M 1978-10-16 1983-09-12 49
USGS 365730122040201 011S002W22K003M 1978-10-16 1980-07-17 8
USGS 365733122043101 011S002W21H001M 1978-10-16 1983-08-04 24
USGS 365733122050801 011S002W21F003M 1974-08-28 1981-07-09 34
USGS 365733122050803 011S002W21F005M 1981-07-09 1983-09-12 25
USGS 365739122051301 011S002W21F001M 1979-07-17 1981-07-09 7
USGS 365739122051302 011S002W21F004M 1978-10-17 1981-03-19 27
USGS 365746122050101 011S002W21C001M 1978-10-16 1981-03-19 29
USGS 365754122061801 011S002W20C001M 1978-10-17 1983-08-05 31
USGS 365758122063601 011S002W19A001M 1978-10-17 1982-08-18 32
USGS 365817122073101 011S002W18L001M 1978-10-17 1983-08-05 24
USGS 365824122073801 011S002W18F002M 1978-10-17 1981-04-14 30
USGS 365831122074701 011S002W18E001M 1978-11-09 1980-11-19 25
USGS 370114122121801 010S003W33E001M 1981-08-17 1983-08-05 3
USGS 370240122091301 010S003W23J001M 1981-08-18 1981-08-18 1
USGS 370245122132501 010S003W19J001M 1979-04-21 1979-04-21 1
USGS 370251122132501 010S003W19H001M 1978-10-17 1983-08-05 20
USGS 370300122083501 010S003W24F001M 1981-08-18 1983-09-12 3
USGS 370325122132201 010S003W18R001M 1981-08-18 2011-04-21 7
USGS 370337122085101 010S003W13M001M 1982-08-18 1983-08-19 2
USGS 370347122083401 010S003W13F001M 1981-08-18 1983-08-19 3
USGS 370700122100001 009S003W27A001M 2011-03-31 2011-03-31 3