EPA Method 180.1

ALS - Columbia offers EPA Method 180.1 testing at these laboratories:

Jacksonville Jacksonville, Florida Laboratory
Kelso Kelso, Washington Laboratory
Rochester Rochester, New York Laboratory
Simi Valley Simi Valley, California Laboratory

Method information displayed is provided for informational purposes only. No warranty (express or implied) is made as to the website accuracy, completeness, or applicability (such as the age of a method and whether or not it applies to your project). Please contact us for assistance. Analytical testing dots

PDF IconView Actual EPA Method 180.1 (PDF File)

EPA Method 180.1:
Turbidity by Turbidimeter. Official Name: Determination of Turbidity by Nephelometry

The method is based upon a comparison of the intensity of light scattered by the sample under defined conditions with the intensity of light scattered by a standard reference suspension. The higher the intensity of scattered light, the higher the turbidity. Readings, in NTU's, are made in a nephelometer designed according to specifications outlined in the method. A standard suspension (i.e., formazin, AMCO-AEPA-1, or Hach Stablcal) is used to calibrate the instrument.

This method is applicable to drinking, surface, and saline waters in the range of turbidity from 0 to 40 nephelometric turbidity units (NTU). Higher values may be obtained with dilution of the sample.

Methods for the Determination of Inorganic Substances in Environmental Samples (EPA/600/R-93/100)

The presence of floating debris and coarse sediments which settle out rapidly will give low readings. Finely divided air bubbles will affect the results in a positive manner. The presence of true color, that is the color of water which is due to dissolved substances which absorb light, will cause turbidities to be low, although this effect is generally not significant with finished waters.

QC Requirements:

Maximum Holding Time:
48 hours (MCAWW, Table I)



0 - 40 NTU

Sample Prep:

Precision was determined by analyzing replicate surface water samples in a single laboratory. The method contains data for samples ranging from 26 to 180 NTU.


Revision Number:
Revision 2.0, August 1993

Test Description:
Turbidity - Nephelom

Date Issued:

Instrument used for this test:

Analytical testing dots
At least 2 analytes can be tested by ALS - Columbia using EPA Method 180.1. Please contact us for all available analytes which can be tested by EPA Method 180.1.

AnalyteCAS Number
Turbidity, FieldCASID10317

Examples:  8260

Examples:  Dioxin
Analytical testing dots

<-- Search All Test Methods

Suggestions? The test methods page continues to expand and improve. If you have suggestions for improvement, we would enjoy hearing from you. Please contact the webmaster here.

Analytical testing dots