QEHL laboratory

Laboratory evidence connected to the environmental decision.

QEHL is ESL’s ISO/IEC 17025 accredited laboratory. Our team connects laboratory testing with sampling, monitoring, interpretation and consulting support.

One connected ESL team

From the sample to the decision

Plan→Sample→Test→Interpret→Act

Parameter finder

Find a testing capability

Search the current reconciled laboratory list by parameter or testing area. Exact matrices and methods are confirmed during quotation.

244 parameter–matrix–method records127 accredited-parameter records27 QEHL records outside scope90 subcontracted records

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Step 2Find the parameter

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Testing areaSample matrix

98 matching records for Potable Water

Parameter	Testing area	Method	Hold time	Delivery and accreditation
AluminiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
ArsenicPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
BariumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
BerylliumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
CadmiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
CalciumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
ChromiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
CobaltPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
CopperPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
IronPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
LeadPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
MagnesiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
ManganesePotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
NickelPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
PotasssiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	QEHL — outside scopeQEHL in-house
SeleniumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
SodiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
ThalliumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	QEHL — outside scopeQEHL in-house
VanadiumPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
ZincPotable Water	Metals	ICP-OES — EPA Method 200.7	6 months once preserved; 7 days unpreserved	Accredited*QEHL in-house
Sodium Absorption RatioPotable Water	Metals	Calculation — N/A	N/A	QEHL — outside scopeQEHL in-house
Total Hardness (Calc.)Potable Water	Metals	Calculation — SM 2340 B	N/A	Accredited*QEHL in-house
Calcium HardnessPotable Water	Metals	Calculation — SM 2340 B	N/A	Accredited*QEHL in-house
Magnesium HardnessPotable Water	Metals	Calculation — SM 2340 B	N/A	Accredited*QEHL in-house
Oil & GreasePotable Water	Organics/ Oil & Grease	Extraction & Gravimetry — EPA 1664 B	28 days once preserved	Accredited*QEHL in-house
Ammonia as NitrogenPotable Water	General Chemistry	Colorimetric, Automated Phenate — SEAL Method EPA 150	28 days once preserved	QEHL — outside scopeQEHL in-house
Total AlkalinityPotable Water	General Chemistry	Indicator Titration — SM 2320 B	14 days	Accredited*QEHL in-house
p-AlkalinityPotable Water	General Chemistry	Indicator Titration — SM 2320 B	14 days	QEHL — outside scopeQEHL in-house
Carbonate AlkalinityPotable Water	General Chemistry	Indicator Titration — SM 2320 B	14 days	QEHL — outside scopeQEHL in-house
Bicarbonate AlkalinityPotable Water	General Chemistry	Indicator Titration — SM 2320 B	14 days	QEHL — outside scopeQEHL in-house
Hydroxide AlkalinityPotable Water	General Chemistry	Indicator Titration — SM 2320 B	14 days	QEHL — outside scopeQEHL in-house
Total AlkalinityPotable Water	General Chemistry	Colorimetric, Automated Methyl Orange — SEAL Method EPA 100	14 days	Accredited*QEHL in-house
Total AlkalinityPotable Water	General Chemistry	Colorimetric, Automated Methyl Orange — SEAL Method EPA 101	14 days	Accredited*QEHL in-house
Total AlkalinityPotable Water	General Chemistry	Colorimetric, Automated Methyl Orange — SEAL Method EPA 102	14 days	Accredited*QEHL in-house
Apparent ColourPotable Water	General Chemistry	Platinum-Cobalt Standard Method — H 8025	48 hours	QEHL — outside scopeQEHL in-house
True ColourPotable Water	General Chemistry	Platinum-Cobalt Standard Method — H 8025	48 hours	QEHL — outside scopeQEHL in-house
Biochemical Oxygen DemandPotable Water	General Chemistry	Dilution Method — H 8043	48 hours	QEHL — outside scopeQEHL in-house
Biochemical Oxygen DemandPotable Water	General Chemistry	Dilution Method — SM 5210 B	48 hours	QEHL — outside scopeQEHL in-house
Chemical Oxygen DemandPotable Water	General Chemistry	Dichromate Method — H 8000	28 days	Accredited*QEHL in-house
Chemical Oxygen DemandPotable Water	General Chemistry	Dichromate Method — H 8000	28 days	Accredited*QEHL in-house
ChloridePotable Water	General Chemistry	Argentometric Method — SM 4500 Cl- B	28 days	Accredited*QEHL in-house
ChloridePotable Water	General Chemistry	Argentometric Method — H 8225	28 days	Accredited*QEHL in-house
ChloridePotable Water	General Chemistry	Mercuric Nitrate Method — H 8206	7 days	Accredited*QEHL in-house
ChloridePotable Water	General Chemistry	Automated Ferricyanide Method — SEAL Method EPA 124	28 days	Accredited*QEHL in-house
ConductivityPotable Water	General Chemistry	Direct Meter Reading — SM 2510 B	24 hours	Accredited*QEHL in-house
ConductivityPotable Water	General Chemistry	Direct Meter Reading — SM 2510 B	24 hours	Accredited*QEHL in-house
Cyanuric AcidPotable Water	General Chemistry	Turbidimetric Method — H 8139	24 hours	Accredited*QEHL in-house
Dissolved OxygenPotable Water	General Chemistry	Luminescence Measurement — DR	24 hours	Accredited*QEHL in-house
Dissolved OxygenPotable Water	General Chemistry	Polarographic/ Galvanic Method — DR	24 hours	Accredited*QEHL in-house
Free ChlorinePotable Water	General Chemistry	DPD Spectrophotometric Method — H 8021	24 hours	Accredited*QEHL in-house
Free ChlorinePotable Water	General Chemistry	Visual Comparison Technique — Hach Test Kit CN-66 Cl2, Free	24 hours	Accredited*QEHL in-house
Total ChlorinePotable Water	General Chemistry	DPD Spectrophotometric Method — H 8021	24 hours	QEHL — outside scopeQEHL in-house
Total ChlorinePotable Water	General Chemistry	Visual Comparison Technique — Hach Test Kit CN-66 Cl2, Total	24 hours	QEHL — outside scopeQEHL in-house
Nitrate and Nitrite as NitrogenPotable Water	General Chemistry	Automated Colorimetry — SEAL Method EPA 113	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	QEHL — outside scopeQEHL in-house
Nitrate and NitritePotable Water	General Chemistry	Automated Colorimetry — SEAL Method EPA 114	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	QEHL — outside scopeQEHL in-house
NitratePotable Water	General Chemistry	Cadmium Reduction — H 8192	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	Accredited*QEHL in-house
Nitrate as NitrogenPotable Water	General Chemistry	Cadmium Reduction — H 8192	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	Accredited*QEHL in-house
Nitrate as NitrogenPotable Water	General Chemistry	Cadmium Reduction — H 8039	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	Accredited*QEHL in-house
NitratePotable Water	General Chemistry	Cadmium Reduction — H 8039	24 hours; 48 hours if filtered. 28 days if preserved with sulfuric acid	Accredited*QEHL in-house
NitritePotable Water	General Chemistry	Diazotization Method — H 8507	48 hours	QEHL — outside scopeQEHL in-house
Nitrite as NitrogenPotable Water	General Chemistry	Diazotization Method — H 8507	48 hours	QEHL — outside scopeQEHL in-house
Nitrite as NitrogenPotable Water	General Chemistry	Automated Colorimetry — SEAL Method EPA 115	48 hours	QEHL — outside scopeQEHL in-house
OrthophosphatePotable Water	General Chemistry	Ascorbic Acid Method — H 8048	24 hours; 48 hours If filtered	Accredited*QEHL in-house
Orthophosphate as PhosphorusPotable Water	General Chemistry	Ascorbic Acid Method — H 8048	24 hours; 48 hours If filtered	QEHL — outside scopeQEHL in-house
OrthophosphatePotable Water	General Chemistry	Automated Colorimetry — SEAL Method EPA 146	48 hours	Accredited*QEHL in-house
Orthophosphate as PhosphorusPotable Water	General Chemistry	Automated Colorimetry — SEAL Method EPA 146	48 hours	QEHL — outside scopeQEHL in-house
PhenolsPotable Water	General Chemistry	4-Aminoantipyrine Method — H 8047	4 hours	Accredited*QEHL in-house
SalinityPotable Water	General Chemistry	Direct Meter Reading — SM 2520 B	24 hours	Accredited*QEHL in-house
Settleable SolidsPotable Water	General Chemistry	Volumetric Analysis — SM 2540 F	48 hours	QEHL — outside scopeQEHL in-house
SulfatePotable Water	General Chemistry	Barium Chloride Turbidimetric Method — H 8051	28 days	Accredited*QEHL in-house
SulfatePotable Water	General Chemistry	Automated Turbidimetric Method — SEAL EPA Method 165	28 days	Accredited*QEHL in-house
Total Dissolved SolidsPotable Water	General Chemistry	Direct Meter Reading — SM 2510 B	24 hours	Accredited*QEHL in-house
Total Dissolved SolidsPotable Water	General Chemistry	Direct Meter Reading — SM 2510 B	24 hours	Accredited*QEHL in-house
Total Dissolved SolidsPotable Water	General Chemistry	Gravimetry — SM 2540 C	7 days	Accredited*QEHL in-house
Total Dissolved SolidsPotable Water	General Chemistry	Gravimetry — SM 2540 B & D	7 days	Accredited*QEHL in-house
TemperaturePotable Water	General Chemistry	Direct Meter Reading — DR	24 hours	QEHL — outside scopeQEHL in-house
Total Hardness (EDTA)Potable Water	General Chemistry	Indicator Titration — SM 2340 C	6 months once preserved	Accredited*QEHL in-house
Total NitrogenPotable Water	General Chemistry	Persulfate Digestion — SM 4500 N-C & H 8039	28 days once preserved	Accredited*QEHL in-house
Total NitrogenPotable Water	General Chemistry	Persulfate Digestion — H 10071	28 days once preserved	Accredited*QEHL in-house
Total PhosphorusPotable Water	General Chemistry	Acid Persulfate Digestion — SM 4500B-5 & H 8048	28 days once preserved	Accredited*QEHL in-house
Total PhosphorusPotable Water	General Chemistry	Acid Persulfate Digestion — H 8190	28 days once preserved	Accredited*QEHL in-house
Total Residual OxidantsPotable Water	General Chemistry	Direct Meter Reading — DR	24 hours	QEHL — outside scopeQEHL in-house
Total SolidsPotable Water	General Chemistry	Gravimetric method — SM 2540 B	7 days	Accredited*QEHL in-house
Total Suspended SolidsPotable Water	General Chemistry	Gravimetry — SM 2540 D	7 days	Accredited*QEHL in-house
TurbidityPotable Water	General Chemistry	Nephelometry — EPA 180.1	48 hours	Accredited*QEHL in-house
pHPotable Water	General Chemistry	Direct Meter Reading — SM 4500 H+	15 minutes	Accredited*QEHL in-house
Total ColiformPotable Water	Microbiology	SM 9221	24 Hours	Accredited*QEHL in-house
Faecal ColiformPotable Water	Microbiology	SM 9221	24 Hours	Accredited*QEHL in-house
Escherichia coliPotable Water	Microbiology	SM 9221	24 Hours	Accredited*QEHL in-house
Total ColiformPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
Faecal ColiformPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
Escherichia coliPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
Total ColiformPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
Faecal ColiformPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
Escherichia coliPotable Water	Microbiology	SM 9222	24 Hours	Accredited*QEHL in-house
EnterococciPotable Water	Microbiology	SM 9230B	24 Hours	Accredited*QEHL in-house
Psuedomonas aeruginosaPotable Water	Microbiology	SM 9213F	24 Hours	Accredited*QEHL in-house
Faecal StreptococciPotable Water	Microbiology	SM 9230B	24 Hours	Accredited*QEHL in-house

How to read the matrixAccredited parameter*QEHL testing outside accredited scopeManaged subcontracted testing

* “Accredited” means the parameter appears on the supplied accreditation list. QEHL confirms the exact parameter, sample matrix and method against its current scope when quoting. Subcontracted services are not represented as QEHL-accredited testing.

Turnaround planning

Standard turnaround is currently planned at 10 business days. Rush work may be available from a minimum of one business day depending on the parameter and additional cost. Subcontracted testing may require 3–4 weeks.

Accreditation stated precisely

QEHL is an ISO/IEC 17025 accredited laboratory. Accreditation applies only to the parameter, matrix and method combinations supported by the current scope or applicable extension letter.

Laboratory FAQ

Before you collect or submit a sample

Simple guidance for clients who may be arranging laboratory testing for the first time. Contact QEHL before collection when you are unsure; the correct container, volume and timing depend on the sample and tests requested.

Do I need to collect the sample myself?

You may collect your own sample using the sampling guidance provided by ESL. ESL also offers sample-collection services where applicable.

Do I need to provide bottles or containers?

ESL provides the required bottles or containers for the requested analysis. Where applicable, these are included in the quotation.

How much sample do I need?

The required amount depends on the sample type and analyses requested. Confirm the testing requirements with QEHL before collecting the sample.

What information should I record?

Record the sampling location, date and time, together with relevant environmental or site conditions at the time of collection.

How should I preserve the sample?

Follow the instructions supplied for your specific analysis. Where cooling is required, place the sample in an ice-filled cooler immediately and maintain the required temperature until submission.

How soon should I submit the sample?

Submit it as soon as possible within the holding time specified by QEHL. Holding times vary by parameter, so confirm the requirements before collection—especially for microbiological or time-sensitive testing.

Need help selecting a parameter or method?

Send the sample type, purpose and required reporting date. The QEHL team will confirm the appropriate route.

Request laboratory support