UCMR4 - Unregulated Contaminant Monitoring Rule
The Safe Drinking Water Act (SDWA) establishes periodic monitoring (every 5 years) through the UCMR to assess occurrence of select constituents from the Contaminant Candidate List (CCL) for potential regulatory consideration. UCMR4 is the 4th cycle of UCMR monitoring.
Who Must Monitor
All large (systems that serve 10,001 people or more) community water systems (CWSs) and non-transient non-community water systems (NTNCWSs) and a selected list of 800 small (systems that serve 25 – 10,000 people) CWSs and NTNCWSs must participate in UCMR monitoring. Consecutive Systems must participate in UCMR4. EPA pays for all analytical costs associated with monitoring for the small water systems.
EPA is only sending UCMR4 participation notices to those systems new to UCMR and also to the small systems. Large water systems who participated in UCMR3 will not be receiving letters from EPA but are still required to login to the CDX system and review/approve their monitoring plan and schedule.
What Must Be Monitored
UCMR4 required monitoring for the following 30 Chemical, Disinfection By-Product (DBP) and Cyanotoxin constituents:
|Total Permethrin (cis-, trans-)||Pesticide||52645-53-1||EPA 525.3||0.04|
|Butylated Hydroxyanisole||Semivolatile||25013-16-5||EPA 530||0.03|
|Total Microcystins||Algal Toxin||-----||EPA 546||0.3|
|Microcystin-LA||Algal Toxin||96180-79-9||EPA 544||0.008|
|Microcystin-LF||Algal Toxin||154037-70-4||EPA 544||0.006|
|Microcystin-LR||Algal Toxin||101043-37-2||EPA 544||0.02|
|Microcystin-LY||Algal Toxin||123304-10-9||EPA 544||0.009|
|Microcystin-RR||Algal Toxin||111755-37-4||EPA 544||0.006|
|Microcystin-YR||Algal Toxin||101064-48-6||EPA 544||0.02|
|Nodularin||Algal Toxin||118399-22-7||EPA 544||0.005|
|Anatoxin-a||Algal Toxin||64285-06-9||EPA 545||0.03|
|Cylindrospermopsin||Algal Toxin||143545-90-8||EPA 545||0.09|
|Haloacetic Acids 5 Total||DBP||-----||EPA 552.3||0.2-2|
|Haloacetic Acids 6 Brominated||DBP||-----||EPA 552.3||0.3-2|
|Haloacetic Acids 9 Total||DBP||-----||EPA 552.3||0.2-2|
|Total Organic Carbon||DBP||7440-44-0||SM 5310C||0.3 mg/L|
When Must Systems Monitor
The UCMR4 monitoring period is 2018-2020. Participating systems have until 12-31-17 to confirm their monitoring start date.
Where Must Samples Be Collected
Groundwater systems must monitor Entry Points to the Distribution System (EPTDs) 2 times (5-7 months apart) for the 17 chemical contaminants. Surface Water & GWUDI systems must monitor EPTDs 4 times (3 months apart) for the 17 chemical contaminants. All systems subject to the DBP Stage 2 Rule must monitor for Bromide/TOC from source locations and Haloacetic Acid groups (HAA5, HAA6, HAA9) from the D/DBP Stage 2 Rule sample location(s). DBP samples must be collected with the same frequency as the 17 chemical constituents. Surface Water & GWUDI systems must monitor for Total Microcystins, Cylindrospermopsin and Anatoxin-a at each EPTDs twice per month for 4 consecutive months in the March-November timeframe. Additional samples for the Microcystin congeners plus Nodularin must be collected but only analyzed if the Total Microcystins sample result is > 0.3 ug/L.
Systems with multiple groundwater entry points for the same water source, can submit a Groundwater Representative Monitoring Plan (GWRMP) to EPA for approval to reduce the total number of EPTDs required for UCMR4. GWRMPs approved for prior UCMR monitoring are already loaded into the CDX. New GWRMPs must be submitted to EPA for approval on or before April 19, 2017.
All systems must login to the CDX and enter their respective source water and DBP sample locations into the system. Presently, only entry point locations are included in the CDX inventories.
Which Laboratories Can Analyze UCMR4 Samples
Only EPA-approved laboratories can analyze UCMR4 constituents, except for the DBP Indicators (TOC and Bromide). For the DBP Indicators, laboratories must still apply to demonstrate to EPA they are State-certified for these tests. Analysis for all other constituents requires an extensive application process (including an Initial Demonstration of Capability for each analyst) and approval from EPA, followed by successful passing of at least 1 Proficiency test (PT) sample. The first PT round for all methods except EPA 544 was issued to laboratories on January 23, 2017. The last day laboratories can apply for EPA approval is April 19, 2017.
How is UCMR4 Data Reported
Monitoring Results will be uploaded by the laboratory (within 120 days from the sample collection date) and approved by the water system (within 60 days of uploading by the lab). Subsequently, UCMR4 data will be transferred by EPA to the National Contaminant Occurrence Database (NCOD) during the course of the UCMR4 for public viewing. In addition to the sample results, laboratories are also required to upload sample Quality Control (QC) data and water systems are required to upload data on treatment and algal bloom characterizations.
How Can Eurofins Help with your UCMR4 Compliance Requirements
Eurofins Eaton Analytical served as an EPA Contractor and Industry Stakeholder assisting in the development of EPA’s UCMR4 monitoring requirements, analytical methods, quality control and data management. Our Monrovia and South Bend laboratories were included as a participant in EPA’s 1st UCMR4 PT for all methods where a PT was available. We can assist you with any of the following UCMR4 tasks:
- Budget Estimation and Planning
- Laboratory Procurement and Contracting
- Sample Site Selection and GWRMP development
- Requirements Training (for Contact Hours credit)
- Sample Collection
- Analysis and Reporting