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Monitoring Results for Individual Sampling Points
(From 2011 to present only,
for prior to 2011 results please go to EDT Download Page)


Water System No. : CA1910070 Federal Type : C
Water System Name : LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER State Type : C
Principal County Served : LOS ANGELES Primary Source : SWP
Status : A Activity Date : 01-01-1976
Distribution System Classification : D5 Max Treatment Plant Classification : T2

NOTICE TO USERS OF THE DATABASE: Users of this database should use care in interpreting these data. Data that does not meet Division of Drinking Water (DDW) data quality objectives is not included and the provided data may not be representative of water served by a water system. For example, the presence of a contaminant in a particular source of water at a given concentration does not necessarily mean that the water from that source was served by the water system to its customers, or, if served, that the contaminant was present at that concentration. Water systems may not use certain sources or may treat or blend them prior to serving the water to customers.

Questions about contaminants in particular sources are best addressed by the specific public water system, or by the associated DDW district office.

The Division of Drinking Water's (DDW's) drinking water quality monitoring schedules identify upcoming required testing of drinking water for water systems in California. These documents should not be used for determining whether water systems are in compliance with monitoring requirements. The purpose for providing these monitoring schedules is to allow water systems to verify that their sampling and analyses have been incorporated into the DDW database and to identify upcoming required monitoring/sampling events.

Notes for Water Systems:
1. The monitoring notification documents should be considered "draft," in that they will change with subsequent updates, and as monitoring data are submitted, or as monitoring schedules are revised .
2. The monitoring notification documents are derived from the DDW Water Quality database and from schedules maintained by DDW districts.
3. If your upcoming monitoring or your data identified as "DUE" are not in agreement with this document, or if your have been advised of any increased monitoring that is not reflected in the report for a particular source, please contact your District Engineer or LPA representative. For a map of the districts, please click here.
4. If your notification report for a source is blank, this does not necessarily indicate compliance with all monitoring requirements.
5. These notification reports may not reflect compliance with initial monitoring for newly regulated constituents, or constituents that require special monitoring frequencies. For example, the DDW database is unable to accurately forecast the vulnerable non-volatile synthetic organic chemical (SOC) frequency for large water systems serving over 3,300 people of 2 quarters every 3 years.
5a. For radionuclide compliance monitoring, a gross alpha (GA) particle activity measurement may be substituted for other measurements when the assigned value is less than 5 pCi/L. The assigned value is calculated by adding 0.84 of the counting error (CE) to the gross alpha result (GA + 0.84xCE). If the assigned value is greater than 5 pCi/L, then the water sample must be analyzed for uranium per Section 64442, Article 5, Chapter 15, Division 4, Title 22 of the California Code of Regulations. In addition, if the difference between the assigned value and the uranium measurement [GA + (0.84 x CE) - U] is greater than 5 pCi/L, analysis for Radium-226 and Radium-228 is required. If you have specific questions, contact your DDW District Office.
6. Some Nitrate (as N) results under storet code 00618, will have a result of �N/A� which stands for �Not Applicable.� This stems from the change in regulation requiring that all nitrate sampling be reported as Nitrate (as N) starting January 1, 2016. Prior nitrate sampling was reported as Nitrate (as NO3). With this change in nitrate reporting requirements, the monitoring schedules have captured the last date of Nitrate (as NO3) sampling and applied it to Nitrate (as N) in determining the next due date [unless there have been Nitrate (as N) samples collected]. The Nitrate (as NO3) result, however, does not carry over to Nitrate (as N) which is why there may be a notation in the �Constituent Identification� column to reference storet code 71850 for the last nitrate result. In these instances, the �Constituent Identification� column will say, �NITRATE (as N) � [see 71850].� Any questions should be referred to your District Engineer.  
Test Legends:
  • PS Code = Primary Station Code; used by laboratories to upload water quality data
  • Old PS Code = (Water System Number)-(Sample Point ID)
  • New PS Code = (Water System Number)_(Facility ID)_(Sampling Point ID) to be used by laboratories to upload water quality data when CLIP (California Laboratory Intake Portal) is implemented
  • Facility Status: A = Active; P = Proposed
  • Certain PS Codes have been removed from this table as they are not intended to have water quality data electronically reported. As an example, a water system may have a PS Code to represent Well 01 and another PS Code to represent Well 01 Chlorination. However, water quality data should only be reported to the PS Code for Well 01. The PS Code for Well 01 Chlorination would be removed from the list to avoid confusion in uploading data. If you notice that a PS Code is missing from the list that may be needed for uploading water quality data, please contact your District Office or Local County Primacy Agency.

Click to hide / show columns: Old PS Code | New PS Code | Facility ID | Sample Point ID | Sample Point Name | Status


Monitoring Schedules for All Sampling Points
Water System Sampling Points
Old PS Codes New PS Codes Facility ID Sample Point ID Sample Point Name Status
1910070-011 CA1910070_011_011 011 011 WELL 04-15 - ACTIVE A
1910070-021 CA1910070_021_021 021 021 WELL 04-25 A
1910070-023 CA1910070_023_023 023 023 WELL 04-27 A
1910070-025 CA1910070_025_025 025 025 WELL 04-29 A
1910070-026 CA1910070_026_026 026 026 WELL 04-30 A
1910070-028 CA1910070_028_028 028 028 ASR WELL 04-32 A
1910070-032 CA1910070_032_032 032 032 WELL 04-36 - STANDBY A
1910070-034 CA1910070_034_034 034 034 WELL 04-38 - STANDBY A
1910070-035 CA1910070_035_035 035 035 WELL 04-39 - STANDBY A
1910070-036 CA1910070_036_036 036 036 WELL 04-41 A
1910070-037 CA1910070_037_037 037 037 ASR WELL 04-62 A
1910070-038 CA1910070_038_038 038 038 WELL 04-67 - STANDBY A
1910070-039 CA1910070_039_039 039 039 WELL 04-68 A
1910070-040 CA1910070_040_040 040 040 WELL 04-65 A
1910070-041 CA1910070_041_041 041 041 ASR WELL 04-66 A
1910070-042 CA1910070_042_042 042 042 WELL 04-61 A
1910070-043 CA1910070_043_043 043 043 ASR WELL 04-63 - STANDBY A
1910070-044 CA1910070_044_044 044 044 ASR WELL 04-64 A
1910070-045 CA1910070_045_045 045 045 ASR WELL 04-69 A
1910070-046 CA1910070_046_046 046 046 WELL 04-70 - STANDBY A
1910070-047 CA1910070_047_047 047 047 WELL 04-71 A
1910070-048 CA1910070_048_048 048 048 WELL 04-72 A
1910070-051 CA1910070_051_051 051 051 RESERVOIR-LANDMARK EFF (ARSENIC BLEND) A
1910070-052 CA1910070_052_052 052 052 FOREBAY-K8-5W EFF (ARSENIC BLEND) A
1910070-053 CA1910070_053_053 053 053 ASR WELL 04-82 A
1910070-054 CA1910070_054_054 054 054 ASR WELL 04-83 A
1910070-055 CA1910070_055_055 055 055 WELL 04-84 A
1910070-056 CA1910070_056_056 056 056 WELL 04-85 - STANDBY A
1910070-058 CA1910070_058_058 058 058 WELL 04-87 A
1910070-062 CA1910070_062_062 062 062 WELL 04-43 A
1910070-063 CA1910070_063_063 063 063 WELL 04-44 A
1910070-066 CA1910070_066_066 066 066 WELL 04-50 - STANDBY A
1910070-067 CA1910070_067_067 067 067 WELL 04-51 A
1910070-069 CA1910070_069_069 069 069 WELL 04-55 A
1910070-070 CA1910070_070_070 070 070 WELL 04-58 A
1910070-071 CA1910070_071_071 071 071 WELL 04-59 A
1910070-072 CA1910070_072_072 072 072 04-50, AVEK CONNECTION - TREATED A
1910070-073 CA1910070_073_073 073 073 WELL 04-60 A
1910070-089 CA1910070_089_089 089 089 WELL 04-73 - STANDBY A
1910070-090 CA1910070_090_090 090 090 WELL 04-74 - STANDBY A
1910070-091 CA1910070_091_091 091 091 WELL 04-80 - STANDBY A
1910070-092 CA1910070_092_092 092 092 WELL 04-81 - STANDBY A
1910070-093 CA1910070_093_093 093 093 WELL 34-7 A
1910070-094 CA1910070_094_094 094 094 WELL 04-76 A
1910070-095 CA1910070_095_095 095 095 WELL 04-77 A
1910070-101 CA1910070_101_101 101 101 FOREBAY H8-DIV ENF (ARSENIC BLENDING) A
1910070-102 CA1910070_102_102 102 102 FOREBY J-TREVOR ENF (ARSENIC BLENDING) A
1910070-104 CA1910070_104_104 104 104 WELLS 4-73, 4-74, 4-80 AND 4-81 A
1910070-105 CA1910070_105_105 105 105 ARSENIC BLENDING A
1910070-106 CA1910070_106_106 106 106 WELLS 4-29, 4-30, 4-66 & 4-69 BLENDING 1 A
1910070-107 CA1910070_107_107 107 107 WELLS 4-29, 4-30, 4-66 & 4-69 BLENDING 2 A
1910070-108 CA1910070_108_108 108 108 WELLS 4-29, 4-30, 4-66 & 4-69 BLENDING 3 A
1910070-113 CA1910070_113_113 113 113 AVE. J ARSENIC BLENDING TANK A
1910070-114 CA1910070_114_114 114 114 04-53, AVEK CONNECTION - TREATED A
1910070-115 CA1910070_115_115 115 115 04-56, AVEK CONNECTION - TREATED A
1910070-116 CA1910070_116_116 116 116 04-59, AVEK CONNECTION - TREATED A
1910070-117 CA1910070_117_117 117 117 04-66, AVEK CONNECTION - TREATED A
1910070-118 CA1910070_118_118 118 118 04-70, AVEK CONNECTION - TREATED A
1910070-119 CA1910070_119_119 119 119 04-71, AVEK CONNECTION - TREATED A
1910070-120 CA1910070_120_120 120 120 34-7, AVEK CONNECTION - TREATED A
1910070-121 CA1910070_121_121 121 121 34-9, AVEK CONNECTION - TREATED A
1910070-124 CA1910070_124_124 124 124 WELLS 4-63, 4-64, 4-82, 4-83 & AVEK A
1910070-125 CA1910070_125_125 125 125 04-70A, AVEK CONNECTION - TREATED A
1910070-126 CA1910070_126_126 126 126 04-73, AVEK CONNECTION - TREATED A
1910070-127 CA1910070_127_127 127 127 SNIP - AVEK CONNECTION A
1910070-128 CA1910070_128_128 128 128 C4-73 AVEK CONNECTION A
1910070-800 CA1910070_DST_800 DST 800 4SM-1 - ...* A
1910070-801 CA1910070_DST_801 DST 801 4SM-2 - ...* A
1910070-802 CA1910070_DST_802 DST 802 4SM-4 - ...* A
1910070-803 CA1910070_DST_803 DST 803 4SM-7 - ...* A
1910070-804 CA1910070_DST_804 DST 804 4SM-8 - ...* A
1910070-805 CA1910070_DST_805 DST 805 4SM-12 -...* A
1910070-806 CA1910070_DST_806 DST 806 D4-2 - 4...* A
1910070-807 CA1910070_DST_807 DST 807 D34-3 - ...* A
1910070-LCR CA1910070_DST_LCR DST LCR Lead and Copper Sample Sites ** A
Old PS Codes Old PS Codes Facility ID Sample Point ID Sample Point Name Status
 
*Please refer to the Stage 2 DBP Monitoring Plan Approval Letter for full sample point names.
**Please use this PS Code for all lead and copper samples.