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UCMR4 Testing

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UCMR4 Testing Laboratory

The Safe Drinking Water Act (SDWA) establishes periodic monitoring (every 5 years) through the Unregulated Contaminants Monitoring Rule (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.

UCMR4 Approved Compliance Monitoring

We are pleased to announce that Eurofins is included in EPA's lab list as fully approved for all 8 test methods:

Eurofins Eaton Analytical, Inc. Monrovia
Eurofins Eaton Analytical, Inc. South Bend

How Can Eurofins Help with your UCMR4 Requirements

Eurofins 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 UCMR4 testing laboratories, located in Monrovia, CA and South Bend, IN were included as a participant in EPA’s 1st UCMR4 proficiency tests for all methods where a proficiency test 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

Who Must Monitor

Monitoring is required by 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. Monitoring is also required of Consecutive Systems. EPA pays for all analytical costs associated with monitoring for the small water systems.

EPA is only sending 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.

UCMR4 Requirements

Monitoring is required for the following 30 Chemical, Disinfection By-Product (DBP) and Cyanotoxin constituents:

UCMR4 Analyte Analyte
Level (ug/L)
Germanium Metal 7440-56-4 EPA 200.8 0.3 
Manganese Metal 7439-96-5 EPA 200.8 0.4 
a-Hexachlorocyclohexane Pesticide 319-84-6 EPA 525.3 0.01 
Chlorpyrifos Pesticide 2921-88-2 EPA 525.3 0.03
Dimethipin Pesticide 55290-64-7 EPA 525.3 0.2
Ethoprop Pesticide 13194-48-4 EPA 525.3 0.03
Oxyfluorfen Pesticide 42874-03-3 EPA 525.3 0.05
Profenofos Pesticide 41198-08-7 EPA 525.3 0.3
Tebuconazole Pesticide 107534-96-3 EPA 525.3 0.2
Total Permethrin (cis-, trans-) Pesticide 52645-53-1 EPA 525.3 0.04
Tribufos Pesticide 78-48-8 EPA 525.3 0.07
1-Butanol Alcohol 71-36-3 EPA 541 2
2-Methoxyethanol Alcohol 109-86-4 EPA 541 0.4
2-Propen-1-ol Alcohol 107-18-6 EPA 541 0.5
Butylated Hydroxyanisole Semivolatile 25013-16-5 EPA 530 0.03
o-Toluidine Semivolatile 95-53-4 EPA 530 0.007
Quinoline Semivolatile 91-22-5 EPA 530 0.02
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
Bromide DBP 24959-67-9 EPA 300.0 20

*In our South Bend laboratory,Total Organic Carbon MRL is 0.5 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 UCMR4 Testing 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), successful passing of Proficiency test (PT) samples and approval from EPA. 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, 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.