Date:06-06-2026STATE OF CALIFORNIA 
LAST AND NEXT SAMPLE REPORT
SYSTEM NO.:1910234SYSTEM NAME:WALNUT VALLEY WATER DISTRICTCOUNTY:LOS ANGELES 
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
CA1910234_001_001 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_002_002 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_003_003 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_004_004 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_005_005 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 13.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2942 BROMOFORM 1.700 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 18.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 1.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 8.800 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 9.500 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 17.000 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2950 TTHM 42.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_800 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 6.400 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_800 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 11.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2942 BROMOFORM 1.500 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 14.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 2.200 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 7.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 13.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 22.000 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2950 TTHM 34.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_801 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 6.500 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_801 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 10.000 0.500 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2942 BROMOFORM 3.400 0.500 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 7.200 0.500 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID < 1.000 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 12.000 0.500 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 5.300 1.000 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 8.000 2.000 UG/L 60 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2950 TTHM 33.000 0.500 UG/L 80 05-13-2026 3 2026/08
CA1910234_DST_802 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 2.700 1.000 UG/L 1 05-13-2026 3 2026/08
CA1910234_DST_802 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 11.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2942 BROMOFORM 1.300 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 15.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 1.300 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 7.400 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 12.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 20.000 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2950 TTHM 35.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_803 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 6.600 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_803 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 9.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2942 BROMOFORM 2.500 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 8.300 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 2.100 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 7.900 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 15.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 22.000 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2950 TTHM 28.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_804 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 4.400 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_804 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 8.500 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2942 BROMOFORM 3.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 7.100 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 11.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 5.700 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 7.400 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2950 TTHM 30.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_805 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 1.700 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_805 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 6.700 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2942 BROMOFORM 2.500 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 5.500 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 1.200 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 9.300 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 5.900 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 8.800 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID < 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2950 TTHM 24.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_806 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 1.700 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_806 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2943 BROMODICHLOROMETHANE 9.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2942 BROMOFORM 1.700 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2941 CHLOROFORM 11.000 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2454 DIBROMOACETIC ACID 2.100 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2944 DIBROMOCHLOROMETHANE 7.300 0.500 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2451 DICHLOROACETIC ACID 16.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2456 TOTAL HALOACETIC ACIDS (HAA5) 25.000 2.000 UG/L 60 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2453 MONOBROMOACETIC ACID < 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2450 MONOCHLOROACETIC ACID 2.200 2.000 UG/L 2 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2950 TTHM 29.000 0.500 UG/L 80 05-12-2026 3 2026/08
CA1910234_DST_807 DISINFECTION BYPRODUCTS 2452 TRICHLOROACETIC ACID 5.000 1.000 UG/L 1 05-12-2026 3 2026/08
CA1910234_DST_807 REGULATED SOC 2414 1,2,3-TRICHLOROPROPANE UG/L 0.005 0.005 3 DUE NOW
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.