&EPA United States Environmental Protection Agency The Third Unregulated Contaminant Monitoring Rule (UCMR 3) Fact Sheet for Assessment Monitoring (List 1 Contaminants) Overview of the Rule *> Title: Revisions to the Unregulated Contaminant Monitoring Rule for Public Water Systems; 77 FR 26072, May 2,2012. *> Purpose: To collect occurrence data for contaminants suspected to be present in drinking water but that do not have health-based standards set under the Safe Drinking Water Act (SDWA). Assessment Monitoring targets contaminants that are analyzed with methods that utilize existing and widely used technology. The UCMR program is the primary source of drinking water contaminant occurrence data used by EPA in regulatory determinations. *> Description: UCMR 3 includes Assessment Monitoring for 21 List 1 chemical contaminants using six EPA-approved analytical methods and four equivalent consensus methods. List 1 contaminants are always associated with an Assessment Monitoring sampling design. Public water systems (PWSs) subject to Assessment Monitoring will sample within a 12-month period during 2013 - 2015. «J« Utilities Affected: Community water systems (CWSs) and non-transient non-community water systems (NTNCWSs) with more than 10,000 retail customers and a representative sample of 800 systems serving 10,000 or fewer retail customers are required to conduct Assessment Monitoring. «J« Occurrence Data: The analytical results from UCMR 3 are stored in the National Contaminant Occurrence Database (NCOD). For a summary of the NCOD results, tips for querying NCOD, and health effects information (including reference concentrations) please refer to the UCMR 3 Data Summary document. Assessment Monitoring (List 1 Contaminants) iwipl 2 Contaminant/ CASRN1 . ... Use or Environmental Source3 Volatile Organic Compounds: EPA Method 524.3 1,2,3-trichloropropane 96-18-4 1,3-butadiene 106-99-0 chloromethane (methyl chloride) 74-87-3 1,1-dichloroethane 75-34-3 0.03 0.1 0.2 0.03 Halogenated alkane; used as an ingredient in paint, varnish remover, solvents and agents degreasing Alkene; used in rubber manufacturing and occurs as a gas Halogenated alkane; used as foaming agent, in production of other substances, and by- product that can form when chlorine used to disinfect drinking water Halogenated alkane; used as a solvent bromomethane Halogenated alkane; occurs as a gas, and used as a fumigant on soil before plantin 74-83-9 after harvest, on vehicles and buildings, and for other specialized purposes chlorodifluoromethane (HCFC-22) 75-45-6 bromochloromethane (Halon 1011) 74-97-5 0.08 0.06 g, on crops Chlorofluorocarbon; occurs as a gas, and used as a refrigerant, as a low-temperature solvent, and in fluorocarbon resins, especially tetrafluoroethylene polymers Used as a fire-extinguishing fluid, an explosive suppressant, and as a solvent in the manufacturing of pesticides Office of Water (MS-140) EPA 815-F-16-003 May 2016 ------- Synthetic Organic Compound: EPA Method 522 1,4-dioxane 123-91-1 0.07 Cyclic aliphatic ether; used as a solvent or solvent stabilizer in manufacture and processing of paper, cotton, textile products, automotive coolant, cosmetics and shampoos Metals: EPA Method 200.8; SM 3125; ASTM D5763-104 vanadium Naturally-occurring elemental metal; used as vanadium pentoxide which is a chemical 7440-62-2 ' intermediate and a catalyst molybdenum 7439-98-7 cobalt 7440-48-4 strontium 7440-24-6 chromium5 CASRN n/a 1 1 0.3 0.2 Naturally-occurring element found in ores and present in plants, animals and bacteria; commonly used form molybdenum trioxide used as a chemical reagent Naturally-occurring element found in the earth's crust and at low concentrations in seawater, and in some surface and ground water; cobaltous chloride was formerly used in medicine and as a germicide Naturally-occurring element; historically, commercial use of strontium has been in the faceplate glass of cathode-ray tube televisions to block x-ray emissions See chromium-6 for use or source information; though the amount measured when analyzing for "total chromium" is the sum of chromium in all of its valence states, the MCL for EPA's current total chromium regulation was determined based upon the health effects of chromium-6 Chromium-6: EPA Method 218.7 chromium-66 18540-29-9 0.03 Naturally-occurring element; used in making steel and other alloys; chromium-3 or -6 forms are used for chrome plating, dyes and pigments, leather tanning, and wood preservation Oxyhalide Anion: EPA Method 300.1; SM 4110D; ASTM D658-08 chlorate Agricultural defoliant or desiccant; disinfection byproduct; and used in production of chlorine 14866-68-3 dioxide Perfluorinated Compounds: EPA Method 537 perfluorooctanesulfonic Surfactant or emulsifier; used in fire-fighting foam, circuit board etching acids, alkaline acid (PFOS) 0.04 cleaners, floor polish, and as a pesticide active ingredient for insect bait traps; U.S. 1763-23-1 manufacture of PFOS phased out in 2002; however, PFOS still generated incidentally perfluorooctanoic acid (PFOA) 335-67-1 perfluorononanoic acid (PFNA) 375-95-1 perfluorohexanesulfonic acid (PFHxS) 355-46-4 perfluoroheptanoic acid (PFHpA) 375-85-9 0.02 0.02 0.03 0.01 Perfluorinated aliphatic carboxylic acid; used for its emulsifier and surfactant properties in or as fluoropolymers (such as Teflon), fire-fighting foams, cleaners, cosmetics, greases and lubricants, paints, polishes, adhesives and photographic films Manmade chemical; used in products to make them stain, grease, heat and water resistant Manmade chemical; used in products to make them stain, grease, heat and water resistant Manmade chemical; used in products to make them stain, grease, heat and water resistant perfluorobutanesulfonic acid (PFBS) 0.09 Manmade chemical; used in products to make them stain, grease, heat and water resistant 375-73-5 | Page 2 of 4 ------- 1. CASRN - Chemical Abstracts Service Registry Number 2. MRL- Minimum Reporting Level 3. "Use or Environmental Source" further documented in UCMR 3 Contaminants - Information Compendium. EPA 81B-B-11-001. January 2012 4. SM-Standard Methods; ASTM-ASTM International 5. Monitoring for total chromium, in conjunction with UCMR 3 Assessment Monitoring, is required under the authority provided in Section 144B(a)(l)(A) of SDWA 6. Chromium-6 will be measured as soluble chromate ion (CASRN 13907-45-4) Assessment Monitoring Time frame: One consecutive 12-month period during January 2013 - December 2015 (monitoring can span more than one calendar year, as long as conducted during a consecutive 12-month period). Frequency: Ground Water. Monitoring will occur twice in one consecutive 12-month period. Sample events must occur 5 - 7 months apart. Surface Water or GUDI: Monitoring will occur in 4 consecutive quarters, with sampling events occurring 3 months apart. Location: Entry point to the distribution system (EPTDS) for all contaminants, as well as distribution system maximum residence time sampling locations for chromium, chromium-6, cobalt, molybdenum, strontium, vanadium and chlorate. Laboratories: Samples must be analyzed by EPA-approved laboratories. Critical Deadlines and Requirements Due Date rtrtrthAi- 1 9fi1 9 August 1, 2012 October 1, 2012 Within 120 days of sample collection Within 60 days of lab posting data Requirement Following Rule Publication Systems must submit contact information to SDWARS. (Any subsequent changes must be submitted within 30 days of the change occurring). Laboratories seeking approval must submit a registration form to participate in the laboratory approval process. Ground water systems that wish to monitor from representative EPTDSs must submit either state-approved, UCMR 2-approved or propose a new representative sampling plan. Deadline for systems to change their monitoring schedule (after October 1, systems must provide an explanation for the requested schedule change and obtain EPA approval of the change). PWSs review/edit if necessary, inventory information for sampling locations. Following Sample Collection Laboratories post data to SDWARS. PWSs review and approve the data. If the PWS has not taken action after 60 days, the data are considered approved and ready for state and EPA review. Report through SDWARS1 X X X X X Contact Sampling Coordinator2 X X X (after October 1) X (after October 1) 1. Safe Drinking Water Accession and Review System 2. Contact via email at: UCMR Sampling Coordinator@epa.gov. Data Elements Public Water System Identification (PWSID) Code Public Water System Facility Identification Code Water Source Type Sampling Point Identification Code Sampling Point Type Code Disinfectant Type Sample Collection Date Sample Identification Code Contaminant Analytical Method Code Sample Analysis Type Analytical Results-Sign Analytical Result-Value Laboratory Identification Code Sample Event Code Page 3 of 4 ------- Additional Information The Public Notification Rule (40 CFR §141.207), published on May 4, 2000 (65 FR 25982) with amendments and corrections included in the Code of Federal Regulations for the Public Notification Rule published on July 1, 2006, requires PWSs to notify the public annually that the results of monitoring for unregulated contaminants are available. CWSs may include their public notice within their CCRs. Details on these reporting requirements can be found in the document: Revised Public Notification Handbook (EPA816-R-09-013). Under the Consumer Confidence Report (CCR) Rule, as specified in 40 CFR§141.153(d), CWSs must report the monitoring results whenever unregulated contaminants are detected. CCRs are delivered to all billing customers each year by July 1. (The CCR Rule does not apply to non-community water systems). Details on these reporting requirements can be found on the CCR Home Page. For More Information * Safe Drinking Water Hotline: (800) 426-4791 * CDX/SDWARS Help Desk: (888) 890 -1995 * UCMR Homepage Page 4 of 4 ------- |