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PS Code Transition


Water System No. : CA3010004 Federal Type : C
Water System Name : MESA WATER DISTRICT State Type : C
Principal County Served : ORANGE 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
3010004-006 CA3010004_006_006 006 006 WELL 05 A
3010004-007 CA3010004_007_007 007 007 WELL 07 A
3010004-008 CA3010004_008_008 008 008 WELL 03B A
3010004-010 CA3010004_010_010 010 010 WELL 06 A
3010004-012 CA3010004_012_012 012 012 WELL 01B A
3010004-014 CA3010004_014_014 014 014 WELL 11 A
3010004-030 CA3010004_030_030 030 030 MESA CONNECTION (OC-14) - TREATED A
3010004-031 CA3010004_031_031 031 031 MESA CONNECTION (OC-44) - TREATED A
3010004-032 CA3010004_032_032 032 032 MESA CONNECTION (CM-2) - TREATED A
3010004-033 CA3010004_033_033 033 033 MESA CONNECTION (CM-6) - TREATED A
3010004-037 CA3010004_038_037 038 037 MWRF INFLUENT A
3010004-038 CA3010004_038_038 038 038 MWRF EFFLUENT A
3010004-039 CA3010004_038_039 038 039 MWRF NANO FILTER FEED A
3010004-040 CA3010004_040_040 040 040 WELL 9B A
3010004-043 CA3010004_043_043 043 043 WELL 12 A
3010004-045 CA3010004_045_045 045 045 WELL 14 A
3010004-801 CA3010004_DST_801 DST 801 SITE 1-4...* A
3010004-802 CA3010004_DST_802 DST 802 SITE 2-3...* A
3010004-803 CA3010004_DST_803 DST 803 SITE 3-1...* A
3010004-804 CA3010004_DST_804 DST 804 SITE 4-M...* A
3010004-805 CA3010004_DST_805 DST 805 SITE 5-1...* A
3010004-806 CA3010004_DST_806 DST 806 SITE 6-2...* A
3010004-807 CA3010004_DST_807 DST 807 SITE 7-1...* A
3010004-808 CA3010004_DST_808 DST 808 SITE 8-3...* A
3010004-LCR CA3010004_DST_LCR DST LCR Lead and Copper Sample Sites ** A
3010004-001 CA3010004_001_001 001 001 SEGERSTROM WELL 01 - DESTROYED I
3010004-002 CA3010004_002_002 002 002 WAKEHAM - DESTROYED I
3010004-003 CA3010004_003_003 003 003 WAKEHAM WELL 02 - MONITORING WELL I
3010004-004 CA3010004_004_004 004 004 WELL 03 - DESTROYED I
3010004-005 CA3010004_005_005 005 005 WELL 04 I
3010004-009 CA3010004_009_009 009 009 WELL 08 - DESTROYED I
3010004-011 CA3010004_011_011 011 011 WELL 09 - DESTROYED I
3010004-013 CA3010004_013_013 013 013 MWDSC - TREATED - INACTIVE I
3010004-015 CA3010004_015_015 015 015 WELL 04 CHLORAMINATION XCLD I
3010004-016 CA3010004_016_016 016 016 WELL 04 OZ -DESTROYED I
3010004-017 CA3010004_017_017 017 017 WELL 05 CHLORAM -DESTROYED I
3010004-018 CA3010004_018_018 018 018 WELL 05 OZ - DESTROYED I
3010004-021 CA3010004_021_021 021 021 WELL 08 CHLORAMINATION - DESTROYED I
3010004-022 CA3010004_022_022 022 022 WELL 06 OZ - DESTROYED I
3010004-023 CA3010004_023_023 023 023 WELL 06 CHLORAM - DESTROYED I
3010004-024 CA3010004_024_024 024 024 WELL 06 BAC - DESTROYED I
3010004-026 CA3010004_026_026 026 026 WELL 11 OZ - DESTROYED I
3010004-027 CA3010004_027_027 027 027 WELL 11 BAC - DESTROYED I
3010004-028 CA3010004_028_028 028 028 WELL 11 CHLORAM - DESTROYED I
3010004-029 CA3010004_029_029 029 029 WELL 05 - UV - PLANT EFFLUENT - INACTIVE I
3010004-034 CA3010004_034_034 034 034 COLORED H2O PLANT EFF - DESTROYED I
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.