UCMR 4 | LCRA UCMR 4 | LCRA


LCRA ELS has temporarily changed its sample drop-off procedures to help protect staff and clients from COVID-19. Read more. The laboratory continues to accept samples from 8 a.m. to 5 p.m. Monday-Friday.

LCRA Environmental Laboratory Services

A NELAP laboratory providing quality testing to safeguard public health and ensure regulatory compliance.

LCRA Environmental Laboratory Services (ELS) is approved for Round 4 of the EPA Unregulated Contaminant Monitoring Rule (UCMR4) and will perform all sampling and analysis in-house for any Public Water System (PWS) in Texas or throughout the Nation. Sampling is scheduled to begin in January 2018 and continue through December 2020. You can obtain your system sampling schedule and registered site locations directly from the EPA.

Meeting EPA requirements

  1. Obtain your schedule from the EPA or contact ELS.
  2. Request a quote and include schedule attachments if applicable.
  3. Sign and return quote to ELS.
  4. ELS will schedule your events.
  5. ELS will ship bottle kits or schedule sampling dates.
  6. ELS will analyze samples.
  7. ELS will deliver the final report to our customers and upload electronic data to the EPA CDX database.

EPA approved methods

  • EPA 546 – Total Microsystin
  • EPA 544 & EPA 545 – Cyanotoxins
  • EPA 200.8 – Metals
  • EPA 525.3 – Pesticides
  • EPA 552.3 – HAAs
  • EPA 541 – Alcohol compounds
  • EPA 530 – Semivolatile compounds
  • SM 5310 C – Total Organic Carbon
  • EPA 300.0 – Bromide

U.S. EPA Fourth Unregulated Contaminant Monitoring Rule

The 1996 Safe Drinking Water Act amendments require that once every five years EPA issue a new list of no more than 30 unregulated contaminants to be monitored by PWSs.

The fourth Unregulated Contaminant Monitoring Rule (UCMR 4) was published in the Federal Register on December 20, 2016. UCMR 4 requires monitoring for 30 chemical contaminants between 2018 and 2020 using analytical methods developed by the EPA and consensus organizations. This monitoring provides a basis for future regulatory actions to protect public health.  For a full list of required parameters to be tested, please visit the U.S. EPA UCMR4 website.

Assessment monitoring:

All PWSs (surface water or groundwater under the direct influence of surface water) serving 25-10,000 people are required to monitor for 10 “List 1” Cyanotoxins during a four-consecutive-month period from March 2018 through November 2020.  PWSs will monitor for 20 additional “List 1″ contaminants during a 12-month period from January 2018 through December 2020.  EPA will randomly select 800 PWSs, and will pay for all analytical costs associated with monitoring.

All PWSs serving more than 10,000 people will monitor for 10 “List 1” Cyanotoxins and 20 additional List 1″ chemicals during a 12-month period from January 2018 through December 2020.