LT2 Schedule 4 (<10,000 served) Public Water Suppliers - Source Water Monitoring
Update: January 2010
The purpose of the LT2 rule is to reduce illness associated with Cryptosporidium
and other disease-causing microorganisms in drinking water. The rule will
further existing regulations by requiring systems with higher concentrations of
Cryptosporidium in their source waters to provide additional treatment.
LT2 requirements and schedule vary according to system size.
LT2 requires Public Water Systems (PWS) serving less than 10,000 people (Schedule 4 PWSs) using surface water sources to monitor their source(s) in a two stage manner:
- E. coli every other week for 12 months (E. coli sampling period was Oct. 2008 through Sep. 2009).
- Cryptosporidium monthly for 24 months or twice monthly for 12 months – if triggered by the E. coli results (average values greater than the trigger levels will require the PWS to conduct Cryptosporidium monitoring, below).
| Source |
Trigger: Average E. coli per 100 mL |
| Lake or Reservoir |
10 |
| River or Stream |
50 |
Deadline #1: January 1, 2010
Schedule 4 PWSs must submit:
- Monitoring plans and sample collection schedules due to regulators
Deadline #2: April 2010 (Triggered Systems)
- Triggered system must begin Cryptosporidium monitoring no late than April 2010
- Samples can be collected once per month for 24 months or twice per month for 12 months.
Laboratory Certification
- ASI is an EPA-approved laboratory for Cryptosporidium and E. coli enumeration under the LT2 Laboratory Quality Assurance Program.
- We have worked with PWS clients throughout the U.S. for more than 20 years and have analyzed over 20,000 Cryptosporidium samples for regulatory compliance.
- ASI is fully staffed and equipped to provide sampling supplies and instructions to clients, and to receive, analyze and report Schedule 4 Cryptosporidium samples.
- ASI is authorized to enter data in the EPA’s Data Collection & Tracking System (DCTS), if necessary.
- ASI is also certified under NELAP by the Florida Dept. of Health for analysis of Drinking Water and Non-Potable water for Total Coliforms and E. coli, by Colilert™ (SM 9223B). ASI is also certified by Vermont, Connecticut, and New Mexico.
Sample Shipment
- For LT2 compliance, Cryptosporidium samples must arrive at the laboratory at ≤20°C (and unfrozen).
- ASI has customized shipping containers and instructions to reduce shipping costs while meeting sample temperature requirements. We have tested shipping containers and packing materials under extreme temperature conditions to ensure temperature integrity.
- Our discounted shipping rates mean typically < $50 to ship samples to our lab from anywhere in the continental U.S.
Further Information
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