EPA Method 180.1 is the gold standard for determining turbidity in drinking, ground, surface, and saline waters. It specifically requires the Nephelometric Method, measuring light scattered at a 90° angle from the incident beam.
Critical Note: To maintain compliance, your facility must use a nephelometer equipped with a tungsten-filament lamp (operating at 2200–3000°K). LED-based meters are typically not compliant with 180.1 (though they may be used for ISO 7027). Samples must be analyzed within 48 hours and stored at 4°C.
We have curated the products below specifically to meet these rigid parameters so you can report with confidence.
Method 180.1 Cheat Sheet
ParameterTurbidity
UnitNTU
Light SourceTungsten Filament
Detector90° Scatter
Holding Time48 Hours (Dark/4°C)
Equipment
⚠️ Must use Tungsten Lamp for 180.1
EPA 180.1In Stock
Lab Series 2100N Turbidimeter
The laboratory standard. Features Ratio mode for color correction and full tungsten compliance. Range: 0-4000 NTU.
$3,250.00
Field Ready
Portable Tungsten Turbidimeter Kit
Rugged, waterproof design for field analysis. Meets 180.1 design specs. Includes carrying case and vials.
$1,100.00
Continuous
Online Process Turbidimeter
For continuous monitoring of drinking water effluent. EPA compliant method with integrated bubble trap.
$2,450.00
Chemicals
Calibrate Quarterly with Primary Standards
Formazin Stock Solution (4000 NTU)
Primary standard. 500mL bottle. Must be diluted to create calibration points. Economical choice.
