Water Sampling Equipment: Bottles, Samplers, Pumps, and Field Kits
A lab-first guide to bottles, samplers, pumps, contact materials, filtration, preservation, and chain of custody for lake and pond samples.
What to do first
Choose sampling equipment only after the laboratory confirms method, bottle type, filtration step, preservative, holding time, and custody requirements for each analyte. The wrong bottle, pump material, or field filter can invalidate an otherwise careful field day.
- Coordinate field kits with laboratory methods before procurement
- Select contact materials and samplers that avoid contamination
- Document filtration, preservation, cooling, and custody without generic shortcuts
- Build a field-day checklist tied to each analyte group
Use this guide inside a field curriculum.
Step 2 of 8 · Previous: Set the decision architecture · Next: Select sondes and sensors by data need
Open the guided path Lake Sample to Result: Collection, Custody, Laboratory, Validation, and ReleaseStep 3 of 9 · Previous: Document task-specific crew readiness · Next: Collect, process, and transfer without losing identity
Open the guided path1. Confirm the laboratory method before buying field gear
The analyte name does not define a sample.
Request the current sampling kit instructions from the selected laboratory for every analyte in the project. Requirements differ for total and dissolved fractions, volatile compounds, nutrients, metals, chlorophyll, cyanotoxins, and microbiological indicators.
Record method code, bottle material, volume, headspace rules, filtration location, preservative type and addition order, maximum holding time, storage temperature, and shipping constraints. Update the field plan when the laboratory changes methods.
- Laboratory method and accreditation status confirmed
- Bottle labels, IDs, and custody seals prepared
- Cooler, ice packs, and temperature logger ready
- Filtration housing, membranes, and forceps if required in the field
- Preservatives with lot, expiration, and addition procedure verified
- Chain-of-custody forms and shipping cutoff times confirmed
2. Match contact materials to the analytes
Pumps, tubing, bailers, and bottles can add or strip analytes.
| Component | Decision driver | Common pitfall |
|---|---|---|
| Sample bottle | Method-specified material and volume | Reusing a bottle type across unrelated analytes |
| Tubing and pump | Chemical compatibility with target analytes | Metal or plastic contact where the method forbids it |
| Bailer or sampler | Depth, zone, and disturbance tolerance | Mixing anoxic bottom water into a surface sample unintentionally |
| Field filter | Pore size and filter type named in the method | Filtering the wrong fraction or using an unapproved membrane |
| Preservative | Analyte-specific addition order and hazard controls | Adding preservative before the laboratory instructs or without PPE plan |
3. Choose samplers and pumps for depth and zone
Integrated, discrete, and depth-specific samples answer different questions.
Define the water column target
Decide whether the question needs surface, mid-depth, near-bottom, whole-profile integrated, or shoreline samples. Document total depth and sample depth on every bottle.
Minimize disturbance
Avoid bottom sediment resuspension unless the method targets it. Rinse equipment with sample water when the method requires it.
Control cross-contamination
Use clean-hands/dirty-hands or equivalent procedures, dedicated equipment for trace analytes, and a sample order that protects the most sensitive bottles.
4. Process samples in the field only when the method requires it
Filtration and preservation are part of the analyte definition.
Some nutrients and metals must be filtered in the field within a method-specific time window. Others must not be filtered. Preservation may be acid, base, chemical fixative, or cooling alone. Never substitute a preservative or holding-time rule from a different project.
Record filtration time, filter lot, field blank collection, and any deviation such as delayed cooling or a dropped bottle. Deviations require a flag and a defined review action, not silent deletion.
5. Clean, label, and seal for defensible custody
Cleaning and custody errors are common and auditable.
- Equipment cleaned per project procedure before the field day
- Unique sample IDs linked to station, depth, and time
- Custody seals applied and sign-offs at each transfer
- Cooling verified before transport and on receipt
- Photographs and field notes tied to sample IDs
- Shipping paperwork matches bottle count and method list
6. Close the field day with acceptance checks
Invalid samples are cheaper to catch at the ramp than in litigation.
Reconcile bottles, custody forms, and field notes before leaving the site. Confirm holding times will be met at laboratory receipt. If a sample is compromised, retain the record and consult the quality assurance plan for replacement requirements.
Sources and review notes
Educational guidance only. LakeTech distributes water quality monitoring equipment and provides deployment, integration, and lake management services; this guide is not a product endorsement or universal specification. Site conditions, designated uses, permits, analytical methods, and state or Tribal requirements vary. Do not use one reading or this guide alone to make a public-health, pesticide, stocking, or treatment decision.
- National Field Manual, Chapter A2: Selection of Equipment for Water SamplingU.S. Geological Survey · field protocol
- National Field Manual, Chapter A3: Cleaning of Equipment for Water SamplingU.S. Geological Survey · field protocol
- National Field Manual, Chapter A4: Collection of Water SamplesU.S. Geological Survey · field protocol
- National Field Manual, Chapter A5: Processing of Water SamplesU.S. Geological Survey · field protocol
- National Lakes Assessment 2022 ManualsU.S. Environmental Protection Agency · field protocol
- National Lakes Assessment 2022 Field Operations ManualU.S. Environmental Protection Agency · field protocol