OHA Drinking Water Services
OR41
PWS ID: 91879 ---- TWIN OAKS ELEMENTARY SD 4J
Lead & Copper

More Information
Summary Results
Detailed Results
Corrosion Control
Service Lines
90th Percentile Summary Results

Sample Dates Date
Received		 Sample
Count		 Frequency Lead
(mg/L)		 Copper
(mg/L)		 Consumer
Notice Date
4/17/2025  4/22/2025 10 6 months 0 0
7/16/2024  7/25/2024 5 3 years 0.0550 0 9/18/2024
9/24/2020  10/1/2020 5 3 years 0.0070 0.072
9/13/2017  9/27/2017 5 3 years 0.0111 0.262
9/30/2014  10/10/2014 5 3 years 0.0053 0
9/30/2011  10/26/2011 5 3 years 0.0095 0
9/30/2008  10/15/2008 5 3 years 0.0094 0
12/31/2003  6/6/2005 5 1 year 0.0045 0
1/1/2000  -  2/8/20003/9/2000 5 1 year 0 0
1/1/1997  -  12/31/19974/27/1998 5 1 year 0.0095 0.031
1/1/1995  -  5/5/19956/19/1995 10 6 months 0.0039 0
7/1/1994  -  12/29/19941/6/1995 10 6 months 0.0076 0


More information for this water system: SDWIS ID 1070
System Info  ::  Report for Lenders  ::  Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Contacts & Advisories  ::  Site Visits  ::  Public Notice
Coliform Summary  ::  Coliform Results  ::  Coliform Schedules  ::  LT2  ::  GW/GWUDI Source Details  ::  Plan Review  ::  Annual Fee
Chemical Summary  ::  Chemical Results  ::  Chemical Schedules  ::  Chemical Schedule Summary  ::  Arsenic RAA  ::  Cyanotoxins  ::  PFAS
Lead & Copper  ::  DBP Sample Sites  ::  FANLs  ::  MRDL  ::  GWR 4-Log  ::  Turbidity  ::  SWTR  ::  LRAA  ::  DW Source Protection
Information for all water systems:
Water System Inventory  ::  Water System Surveys  ::  Outstanding Performers  ::  Treatment Plant Inspections  ::  Treatment  ::  Plan Reviews
Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Deficiencies  ::  System Scores  ::  Exceedances  ::  Public Notices  ::  Service Lines
Water Advisories  ::  Contact Reports  ::  Cyanotoxins  ::  PFAS  ::  Post-wildfire VOCs  ::  Fluoride  ::  Certification List  ::  DW Source Protection
Main menu:
Introduction  ::  Data Search Options  ::  Water System Search  ::  DWS Home  ::  DWS Rules
Need help? Email Drinking Water Services for assistance.Staff/Partner Login