Date:05-19-2024STATE OF CALIFORNIA 
LAST AND NEXT SAMPLE REPORT
SYSTEM NO.:4100509SYSTEM NAME:COUNTY SERVICE AREA 7COUNTY:SAN MATEO 
SOURCE NO.:All SourcesSOURCE NAME:N/ASOURCE CLASS:N/ASTATUS:N/A



Click to hide / show columns: PS Codes | Group Name | Analyte Number | Analyte Name | Detected Level |Less Than | RL | Unit | MCL | DLR | Last Sampled | Frequency | Next Due | Notes

PS Codes Group Name Analyte Number Analyte Name Results Unit MCL DLR Last Sampled Frequency Next Due Notes
Detected Level Less Than RL
CA4100509_001_001 SECONDARY/GP-202404 1928 ALKALINITY, BICARBONATE 286.000 10.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1919 CALCIUM 92.000 1.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1929 ALKALINITY, CARBONATE < 10.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1017 CHLORIDE 22.000 1.000 MG/L 500 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1905 COLOR 15.000 3.000 UNITS 15 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1022 COPPER, FREE < 20.000 UG/L 1000 50 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 2905 FOAMING AGENTS (SURFACTANTS) < 0.050 MG/L .5 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1915 HARDNESS, TOTAL (AS CACO3) 377.000 5.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1021 HYDROXIDE AS CALCIUM CARBONATE < 10.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1028 IRON 1070.000 30.000 UG/L 300 100 01-22-2024 3 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1031 MAGNESIUM 35.600 0.500 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1032 MANGANESE < 15.000 UG/L 50 20 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1920 ODOR < 1.000 TON 3 1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1925 PH 8.400 1.000 pH 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1050 SILVER < 1.500 UG/L 100 10 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1052 SODIUM 36.000 1.000 MG/L 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1064 CONDUCTIVITY @ 25 C UMHOS/CM 810.000 10.000 UMHO/CM 1600 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1055 SULFATE 175.000 2.000 MG/L 500 .5 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1930 TDS 548.000 10.000 MG/L 1000 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 0100 TURBIDITY 0.600 0.100 NTU 5 .1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 SECONDARY/GP-202404 1095 ZINC < 30.000 UG/L 5000 50 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1002 ALUMINUM 28.000 15.000 UG/L 1000 50 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1074 ANTIMONY, TOTAL < 0.500 UG/L 6 6 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1005 ARSENIC < 1.000 UG/L 10 2 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-203007 1094 ASBESTOS < 0.200 MFL 7 .2 07-06-2021 108 2030/07
CA4100509_001_001 INORGANIC-202404 1010 BARIUM 51.200 5.000 UG/L 1000 100 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1075 BERYLLIUM, TOTAL < 0.500 UG/L 4 1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1015 CADMIUM < 0.250 UG/L 5 1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1020 CHROMIUM < 1.000 UG/L 50 10 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202409 1024 CYANIDE < 4.000 UG/L 150 100 09-28-2023 12 2024/09
CA4100509_001_001 INORGANIC-202404 1025 FLUORIDE 0.300 0.100 MG/L 2 .1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1035 MERCURY < 0.300 UG/L 2 1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1036 NICKEL 7.600 5.000 UG/L 100 10 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202504 1039 PERCHLORATE < 0.500 UG/L 6 1 04-25-2024 12 2025/04
CA4100509_001_001 INORGANIC-202404 1045 SELENIUM 2.100 1.000 UG/L 50 5 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 INORGANIC-202404 1085 THALLIUM, TOTAL < 0.500 UG/L 2 1 04-27-2023 12 2024/04 DUE NOW
CA4100509_001_001 NITRATE/NITRITE-202407 1040 NITRATE < 0.400 MG/L 10 .4 04-29-2024 3 2024/07
CA4100509_001_001 NITRATE/NITRITE-202704 1041 NITRITE < 0.100 MG/L 1 .4 04-29-2024 36 2027/04
CA4100509_001_001 RADIOLOGICAL-202507 4109 GROSS ALPHA PARTICLE ACTIVITY 1.800 +/- 2.180 2.600 PCI/L 15 3 07-20-2016 108 2025/07
CA4100509_001_001 REGULATED VOC-202504 2981 1,1,1-TRICHLOROETHANE < 0.500 UG/L 200 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2988 1,1,2,2-TETRACHLOROETHANE < 0.500 UG/L 1 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2985 1,1,2-TRICHLOROETHANE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2978 1,1-DICHLOROETHANE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2977 1,1-DICHLOROETHYLENE < 0.500 UG/L 6 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2378 1,2,4-TRICHLOROBENZENE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2968 O-DICHLOROBENZENE < 0.500 UG/L 600 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2980 1,2-DICHLOROETHANE < 0.500 UG/L .5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2983 1,2-DICHLOROPROPANE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2413 1,3-DICHLOROPROPENE < 0.500 UG/L .5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2969 P-DICHLOROBENZENE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2990 BENZENE < 0.500 UG/L 1 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2982 CARBON TETRACHLORIDE < 0.500 UG/L .5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2380 CIS-1,2-DICHLOROETHYLENE < 0.500 UG/L 6 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2964 DICHLOROMETHANE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2992 ETHYLBENZENE < 0.500 UG/L 300 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2251 METHYL TERT-BUTYL ETHER < 0.500 UG/L 13 3 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2989 CHLOROBENZENE < 0.500 UG/L 70 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2996 STYRENE < 0.500 UG/L 100 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2987 TETRACHLOROETHYLENE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2991 TOLUENE < 0.500 UG/L 150 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2979 TRANS-1,2-DICHLOROETHYLENE < 0.500 UG/L 10 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2984 TRICHLOROETHYLENE < 0.500 UG/L 5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2218 TRICHLOROFLUOROMETHANE < 5.000 UG/L 150 5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2904 TRICHLOROTRIFLUOROETHANE < 10.000 UG/L 1200 10 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2976 VINYL CHLORIDE < 0.500 UG/L .5 .5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED VOC-202504 2955 XYLENES, TOTAL < 0.500 UG/L 1750 0.5 04-25-2024 12 2025/04
CA4100509_001_001 REGULATED SOC-202604 2414 1,2,3-TRICHLOROPROPANE < 0.005 UG/L 0.005 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2110 2,4,5-TP < 1.000 UG/L 50 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2105 2,4-D < 10.000 UG/L 70 10 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2051 LASSO (ALACHLOR) < 1.000 UG/L 2 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2050 ATRAZINE < 0.500 UG/L 1 .5 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2625 BENTAZON < 2.000 UG/L 18 2 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2306 BENZO(A)PYRENE < 0.100 UG/L .2 .1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2046 CARBOFURAN < 5.000 UG/L 18 5 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2959 CHLORDANE < 0.100 UG/L .1 .1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2031 DALAPON < 10.000 UG/L 200 10 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2035 DI(2-ETHYLHEXYL) ADIPATE < 3.000 UG/L 400 5 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2039 DI(2-ETHYLHEXYL) PHTHALATE < 3.000 UG/L 4 3 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2931 1,2-DIBROMO-3-CHLOROPROPANE < 0.010 UG/L .2 .01 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2041 DINOSEB < 2.000 UG/L 7 2 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2032 DIQUAT < 4.000 UG/L 20 4 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2033 ENDOTHALL < 45.000 UG/L 100 45 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2005 ENDRIN < 0.100 UG/L 2 .1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2946 ETHYLENE DIBROMIDE < 0.020 UG/L .05 .02 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2034 GLYPHOSATE < 25.000 UG/L 700 25 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2065 HEPTACHLOR < 0.010 UG/L .01 .01 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2067 HEPTACHLOR EPOXIDE < 0.010 UG/L .01 .01 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2274 HEXACHLOROBENZENE < 0.500 UG/L 1 .5 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2042 HEXACHLOROCYCLOPENTADIENE < 1.000 UG/L 50 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2010 BHC-GAMMA < 0.200 UG/L .2 .2 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2015 METHOXYCHLOR < 10.000 UG/L 30 10 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2626 MOLINATE < 2.000 UG/L 20 2 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2036 OXAMYL < 20.000 UG/L 50 20 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2326 PENTACHLOROPHENOL < 0.200 UG/L 1 .2 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2040 PICLORAM < 1.000 UG/L 500 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2383 TOTAL POLYCHLORINATED BIPHENYLS (PCB) < 0.500 UG/L .5 .5 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2037 SIMAZINE < 1.000 UG/L 4 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2727 THIOBENCARB (BOLERO) < 1.000 UG/L 70 1 04-27-2023 36 2026/04
CA4100509_001_001 REGULATED SOC-202604 2020 TOXAPHENE < 1.000 UG/L 3 1 04-27-2023 36 2026/04
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2943 BROMODICHLOROMETHANE 13.000 0.500 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2942 BROMOFORM < 0.500 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2941 CHLOROFORM 25.000 0.500 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2454 DIBROMOACETIC ACID 1.500 1.000 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2944 DIBROMOCHLOROMETHANE 4.500 0.500 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2451 DICHLOROACETIC ACID 12.000 1.000 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2456 TOTAL HALOACETIC ACIDS (HAA5) 31.000 2.000 UG/L 60 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2950 TTHM 42.000 0.500 UG/L 80 03-19-2024 3 2024/06
CA4100509_DST_900 DISINFECTION BYPRODUCTS-202406 2452 TRICHLOROACETIC ACID 17.000 1.000 UG/L 1 03-19-2024 3 2024/06
PS Codes Group Name Analyte Number Analyte Name Detected Level Less Than RL Unit MCL DLR Last Sampled Frequency Next Due Notes

RL – Reporting Level means the level to which the laboratory reported the presence of an analyte. For radionuclides, Reporting Level is the MDA95.

DLR – Detection Limit for purposes of Reporting (DLR) means the designated minimum level at or above which any analytical finding of a contaminant in drinking water resulting from monitoring required under Chapter 15 of Title 22 shall be reported to the State Board (California Code of Regulations Section § 64400.34)

For addtional definitions, please refer to our data dictionary.