Use this EPA compliance page to download and identify the right Hach method for your application. Products. Support. Expertise. Hach provides the right solution for your specific application. With over 60 years of experience delivering the right solutions and the greatest number of EPA approved methods, Hach is your trusted partner in water analysis.
EPA-Approved Methods The EPA has evaluated and approved new technological methods developed by Hach Company. All EPA-Approved methods are cited in the Federal Register and compiled in the Code of Federal Regulations at 40 CFR 136 and CFR 141. EPA-Accepted Methods The EPA has reviewed Hach methods and accepted them for use in compliance monitoring. These methods are defined by EPA as Acceptable versions of previously approved methods. These methods are generally not published in the Federal Register or in the Code of Federal Regulations. A facsimile of the EPA- Acceptance letter is available upon request. Hach Equivalent Methods All EPA-Approved methods have specification criteria built into their procedural steps. When an approved or accepted EPA method has been packaged by Hach from the EPA reference method as a test method that meets or exceeds these specification criteria, these methods are deemed to be equivalent for use in EPA compliance monitoring (40 CFR 136.6). EPA does not normally issue equivalence letters of packaged reference methods. Hach maintains the formulation, procedure, and data demonstrating equivalency and is available upon request.		Hach Approved Methods These methods may be used for compliance monitoring. They have either obtained an EPA Approval or Acceptance letter, or the method is a packaged product that follows an EPA Reference method and is deemed Equivalent by Hach. With any method used for compliance reporting, always consult with your local regulatory authority. » Hach Methods for Regulatory Reporting » Hach Methods EPA Acceptance Letters

Analyte		Sample Matrix		Hach Method		Approval Type		Reference Method
Acidity, as CaCO3		WW		8010		Accepted		SM 2310 B(4a)
Acidity, Methyl Orange, Digital Titration		WW		8201		Equivalent		SM 2310 B(4a)
Acidity, Phenolphthalein, Digital Titration		WW		8202		Equivalent		SM 2310 B(4a)
Alkalinity, Digital Titration		WW		8203		Equivalent		SM 2320 B
Alkalinity, Titration		DW		8221		Equivalent		SM 2320 B
Ammonia as Nitrogen		WW		TNT830		Equivalent		EPA 350.1, SM 4500-NH3 G or H
Ammonia as Nitrogen		WW		TNT831		Equivalent		EPA 350.1, SM 4500-NH3 G or H
Ammonia as Nitrogen		WW		TNT832		Equivalent		EPA 350.1, SM 4500-NH3 G or H
Ammonia Nitrogen, Electrode		WW		10001		Equivalent		SM 4500-NH3 D, E, F, or G
Ammonia Nitrogen, Known Addition, Electrode		WW		10002		Equivalent		SM 4500-NH3 D, E, F, or G
Ammonia, as Nitrogen		WW		8038		Accepted		SM 4500-NH3 C
Arsenic, Total		WW		8013		Accepted		SM 3500-As B or C
BOD		WW		8043		Accepted		SM 5210 B
Chemical Oxygen Demand		WW		8000		Approved		40 CFR 136.3
Chemical Oxygen Demand		WW		8231		Accepted		EPA 410.3 or SM 5220 C
Chemical Oxygen Demand		WW		TNT821		Equivalent		EPA 410.4 or SM 5220 D
Chemical Oxygen Demand		WW		TNT822		Equivalent		EPA 410.4 or SM 5220 D
Chloride, Mercuric Nitrate		WW		8206		Accepted		SM 4500-Cl C
Chloride, Mercuric Nitrate, Digital Titration		WW		8206		Accepted		SM 4500-Cl C
Chloride, Silver Nitrate		WW		8225		Accepted		SM 4500-Cl B
Chlorine, Free		DW		8021		Accepted		SM 4500-Cl G
Chlorine, Free & Total		DW		10231 10232		Equivalent		SM 4500-Cl G
Chlorine, Free Amperometric Titration		DW		8334		Equivalent		SM 4500-Cl D
Chlorine, Free Amperometric Titration		WW		8334		Equivalent		SM 4500-Cl D
Chlorine, Total Amperometric Forward Titration		DW		10126		Equivalent		SM 4500-Cl D
Chlorine, Total Residual		WW		8167		Accepted		SM 4500-Cl G
Chlorine, Total Residual		DW		8167		Accepted		SM 4500-Cl G
Chlorine, Total Residual		DW		8168		Accepted		SM 4500-Cl D
Chlorine, Total Residual		WW		8168		Accepted		SM 4500-Cl D
Chlorine, Total Residual, Amperometric Back Titration		WW		10025		Accepted		SM 4500-Cl C
Chlorine, Total Residual, DPD		WW		10014		Accepted		SM 4500-Cl G
Chlorine, Total, DPD		DW		8370		Accepted		SM 4500-Cl G
Chromium VI		WW		TNT854		Equivalent		SM 3500-Cr D
Chromium VI, Dissolverd		WW		8023		Accepted		SM 3500-Cr B or D
Coliform, Fecal, EC Medium with/MUG		DW		10018		Equivalent		SM 9221 D
Coliform, Total and E. coli, m-ColiBlue24		DW		10029		Approved		40 CFR 141.21
Coliforms, E. coli, m-TEC		SW		8367		Equivalent		EPA 1103.1
Coliform, Fecal and Total, MPN, A1 Medium		DW		8368		Equivalent		SM 9221 B/D
Coliform, P/A		DW		8319		Equivalent		SM 9221 D
Color, APHA Pt-CO		DW		8025		Equivalent		SM 2120 B
Conductivity		DW		8160		Accepted		SM 2510 B
Copper, Bicinchoinate Procedure		WW		8506		Approved		SM 3500-CU C or E
E. coli, m-ColiBlue24		WW		10029		Approved		Federal Register March 26, 2007
E. coli, m-ColiBlue24, enumeration		SW		10029		Approved		68 FR 43274, July 21, 2003
E. coli, m-ColiBlue24, PA		DW		10029		Approved		40 CFR 141.21
Fecal Coliform, LT Broth and EC		SW		8001A		Accepted		SM 9221 E
Fecal Coliform, LT Broth and EC		SS		8001A		Accepted		SM 9221 E
Fecal Coliform, Sludge, MPN, A1 Medium		WW		10028		Equivalent		SM 9221 D/E
Fecal Coliform, Sludge, MPN, LTB/EC Medium		WW		10027		Equivalent		SM 9221 D/E
Fluoride		DW		8029		Accepted		SM 4500-F C
Fluoride, Electrode		DW		8323		Equivalent		SM 4500-F C
Fluoride, Electrode		WW		8323		Equivalent		SM 4500-F C
Fluoride, SPADNS		WW		8029		Accepted		SM 4500-F D
Fluoride, SPADNS		DW		8029		Accepted		SM 4500-F D
Fluoride, SPADNS2, Arsenic Free		WW		10225		Equivalent		SM 4500-F D
Fluoride, SPADNS2, Arsenic Free		DW		10225		Equivalent		SM 4500-F D
Fluoride, Total		WW		8029		Accepted		SM 4500-F-B or C
Hardness, Calcium, Digital Titration		WW		8204		Equivalent		SM 3500-Ca D
Hardness, Calcium, Titration		WW		8222		Equivalent		SM 3500-Ca D
Hardness, Calcium, Titration		DW		8222		Equivalent		SM 3500-Ca D
Hardness, Total		WW		8226		Accepted		SM 2340 B or C
Hardness, Total, Digital Titration		WW		8213		Equivalent		SM 2340 B or C
Hydrogen Ion, pH		WW		8156		Accepted		SM 4500-H+ B
Iron		WW, DW		10229		Equivalent		Hach Method 8008 Federal Register, June 27, 1980; 45 (126:43459)
Lead, Total		WW		8033		Accepted		SM 3500-Pb B or D
Manganese		WW		8034		Approved		40 CFR 136
Nickel, Total		WW		8037		Accepted		SM 3500-Ni D
Nitrate, ISE		DW		8324		Accepted		SM 4500-NO3D
Nitrite as Nitrogen		WW		TNT839		Equivalent		SM 4500-NO2 B
Oil and Grease, Gravimetric		WW		10056		Equivalent		EPA 1664 or SM 5220 B
Oxygen, Dissolved, Luminescence		WW		10360		Approved*		ASTM D888-05 or 28-37 Hach Method 10360
Oxygen, Dissolved, Polargraphic		WW		8157		Accepted		SM 4500-O G
Oxygen, Dissolved, Winkler		WW		8229		Accepted		SM 4500-O C
Ozone, Colorimetric		DW		8311		Equivalent		SM 4500-OS3 B
pH		DW		8156		Accepted		EPA 151.1, 2; SM 4500-H+ B
Phenols, 4AAP Procedure		WW		8047		Accepted		EPA 420.1
Phosphate, Ortho		WW		8048		Accepted		SM 4500-P E
Phosphate, Ortho		WW		TNT843		Equivalent		SM 4500-P E
Phosphate, Ortho		WW		TNT844		Equivalent		SM 4500-P E
Phosphate, Ortho		WW		TNT845		Equivalent		SM 4500-P E
Phosphorus, Total		WW		TNT843		Equivalent		SM 4500-P E
Phosphorus, Total		WW		TNT844		Equivalent		SM 4500-P E
Phosphorus, Total		WW		TNT845		Equivalent		SM 4500-P E
Phosphorus, Total		WW		8190		Accepted		SM 4500-P E
Silica, Colorimetric		DW		8186		Equivalent		SM 4500-Si E; SM 4500-SiO2 E
Solids, Dissolved		WW		8277		Equivalent		SM 2540 C
Solids, Filterable		WW		8163		Equivalent		SM 2540 C
Solids, Settable		WW		8165		Equivalent		SM 2540 F
Solids, Total		WW		8271		Equivalent		SM 2540 B
Solids, Total Non-filterable		WW		8158		Accepted		SM 2540 D
Solids, Volatile, Non-filterable		WW		8164		Equivalent		EPA 160.4
Specific Conductance		WW		8160		Accepted		EPA 120.1; SM 2510 B
Sulfate as SO4		WW		8051		Accepted		ASTM D516-90, O2
Sulfide as S		WW		8131		Accepted		SM 4500-S2 E or F
Sulfite as SO3		WW		8071		Accepted		SM 4500-SO3 B
Sulfite, Digital Titration		WW		8216		Equivalent		SM 4500-SO3 B
Total and Fecal Coliforms, m-Endo		DW		8074		Equivalent		SM 9222 A/D
Total and Fecal Coliforms, m-Endo		SW		8074		Equivalent		SM 9222 A/D
Total Coliform, LT Broth and BGB Broth		WW		8001		Acceoted		SM 9221 B
Turbidity		DW		8195		Approved		40 CFR 141
Turbidity		DW		10133		Approved		40 CFR 141
Turbidity		DW		GLI		Approved		40 CFR 141
Zinc		WW		8009		Approved		40 CFR 136
†DW = Drinking Water; SS = Sewage Sludge; SW = Surface Water; WW = Wastewater * Regional-wide approval in EPA Region 4 (Alabama, Florida, Georgia, Kentucky, North Carolina, South Carolina, and Tennessee) and EPA Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas). State-wide approval in Minnesota and Wyoming. All other states require a letter from respective EPA Regional Administrators or State Regulatory