Sample Schedule, Purchase System
Sample Schedule Guidance
Water systems have different monitoring requirements based on factors like water system type, source water type, and population served. In order to understand how often your water system needs to test for different contaminants, you must develop sample schedules customized to your own water system. First, review the information available at http://www.deh.enr.state.nc.us/pws/schedules.html. Then, use this guide to document your system’s requirements.
How to Use this Guide
This guide includes an example monitoring schedule and blank forms that you can copy and fill in. The example monitoring schedule is typical for a purchase water system serving 3,000 people. Your sampling requirements may be different. Monitoring requirements for some distribution samples vary with population.
If you do not know the Facility IDs in your system, it can be found on Drinking Water Watch at http://www.deh.enr.state.nc.us/pws/pws_data.htm.
***Note about asbestos sampling: water systems located in a vulnerable county or whose systems contain any asbestos cement pipe may be required to sample for asbestos.***
Special instructions for new systems
Sample schedules must be submitted as part of a Water System Management Plan (WSMP). Water systems must have a complete WSMP before receiving an Authorization to Construct from the Public Water Supply Section. Purchase systems will always have a distribution facility labeled D01.
Definitions
· Water System Facility: A unit of the water system. All water systems have a distribution facility whose ID is D01.
· Source water type. Surface water (water from lakes and rivers) tends to have higher levels of some chemicals than groundwater. This may change the system’s sampling requirements.
EXAMPLE
Sample Schedule, New Purchase Water System
Water System ID: NC0202020
Water System Name: Example New Purchase System
Number of Entry Points: ___1__
Population Served: _3,000
Facility Name: Distribution
Facility ID: D01
Analyte Group or Individual Analyte / Number of Samples / FrequencyBacti (total Coliform) / 3 / Monthly
Asbestos / 1 / First year, then every 9 yrs
Lead and Copper / 20 / Every 6 months
Total trihalomethanes (TTHM) and
Haloacetic Acids (HAA5) / 1 MRT site (1 per
entry point) / Quarterly for surface water
Annually between 7/1 and 9/30 for ground water
Sample Schedule, Purchase Water System
Sample Schedule, Purchase Water System
Water System ID: NC______
Water System Name: ______
Number of Entry Points: _____
Population Served: _____
Facility Name: Distribution
Facility ID: D01
Analyte Group or Individual Analyte / Number of Samples / Frequency