Use test results to define the treatment problem
A useful test scope reflects the source, intended use and suspected risks. Design-critical and health-related decisions should rely on appropriate methods and current applicable standards.
Examples published by DPHE
DPHE publishes water-quality parameters with Bangladesh standards and WHO guideline values. The examples below are reproduced as a practical reference; always verify the current applicable requirement for the intended use.
| Parameter | Bangladesh value shown by DPHE | WHO value shown by DPHE |
|---|---|---|
| Arsenic | 0.05 mg/L | 0.01 mg/L |
| Iron | 0.3–1.0 mg/L | — |
| Total dissolved solids | 1000 mg/L | — |
| Faecal coliform | 0 CFU/100 mL | 0 |
| Total coliform | 0 CFU/100 mL | 0 |
A website summary is not a substitute for an official standard, laboratory result or project-specific regulatory requirement.
What to send with a report
- Water source and location
- Intended use
- Approximate daily demand
- Peak usage or operating hours
- Any visible or operational problems
Parameters depend on the application
Groundwater
Arsenic, iron, manganese, hardness, TDS, pH and microbiological parameters may be relevant depending on source and intended use.
RO feed water
RO design can require broader information on dissolved salts, hardness, alkalinity, silica, iron, manganese and other fouling or scaling risks.
Wastewater
ETP or STP design usually needs parameters linked to hydraulic load, organic load, solids, pH, oil/grease and the specific wastewater source.
Official reference: DPHE — Water Quality Parameters · WHO — Arsenic