Persistent sewage odours are one of the most frustrating issues in residential properties. They are intermittent, subjective, and difficult to document — which often leads to disputes between tenants, landlords, and property managers. Ammonia testing provides an objective, science‑based way to determine whether the smell is linked to urine contamination or a sewage‑gas intrusion.
LCS Laboratory developed a DIY ammonia air‑testing method based on the analytical principles of NIOSH Method 6015, adapted for diffusive (passive) sampling. The method is designed specifically for residential investigations and requires no pumps, power, or technical training.
Why Ammonia Is a Reliable Indicator
Ammonia (NH₃) is a volatile gas released from:
- Urine residues in carpets, subfloors, or walls
- Sewage backflow or dried sewage deposits
- Cracked or improperly vented plumbing
- Pet contamination in rental units
- Decomposing organic waste
Because ammonia evaporates readily and produces a sharp, irritating odour, it becomes a measurable tracer for biological waste and sewage‑related contamination.
How the DIY Test Works
1. LCS Laboratory supplies the sampling devices
Each kit includes a diffusive ammonia sampler designed to absorb ammonia from the surrounding air over several hours.
2. You place the sampler in the area of concern
Common locations include bathrooms, basements, utility rooms, and any space with persistent “sewer smell” complaints. Sampling duration: 8–10 hours.
3. Return the sampler to LCS Laboratory
Our analysts extract the captured ammonia and quantify it using ion chromatography. We then calculate the time‑weighted average concentration in the room.
4. You receive a clear, defensible report
Your report includes:
- Measured ammonia concentration (mg/m³)
- Comparison to typical residential background levels
- Interpretation of whether contamination is likely
- Notes on potential sources
Reference Values for Residential Ammonia Levels
These ranges help you interpret your results and understand whether the measured ammonia is consistent with normal indoor conditions or indicates contamination.
Normal Background Levels
- < 0.1 mg/m³ Typical for urban homes and apartments. Indicates clean indoor conditions with no detectable urine or sewage contamination.
Elevated but Common Levels
- Up to ~2 mg/m³ Possible in busy kitchens, areas with strong cleaning‑product use, or spaces with poor ventilation. Not typically associated with sewage or urine contamination.
Levels Suggesting Contamination
- 2–20 mg/m³ Indicates significant contamination. Common in properties with urine‑soaked materials, dried sewage residues, or active sewer‑gas intrusion. These levels often correlate with noticeable odours.
High and Potentially Unsafe Levels
- > 20 mg/m³ Indicates heavy contamination and a strong, persistent smell. Suggests an active sewage leak, severe urine saturation, or a major plumbing failure. At this level, the environment may be irritating to occupants and requires prompt investigation.
When to Consider Ammonia Testing
This DIY method is especially useful when:
- Tenants report persistent sewage or “cat urine” odours
- A landlord needs objective documentation for remediation
- A property manager must verify cleaning after tenant turnover
- A unit has a history of plumbing or drainage issues
- Odours appear intermittently and are difficult to trace
- Insurance or legal documentation is required
A Defensible, Easy‑to‑Use Tool for Odour Investigations
Sewage odours are disruptive and difficult to prove. Ammonia testing provides a clear, measurable indicator of whether the smell is linked to urine contamination or sewer‑gas intrusion.
LCS Laboratory’s diffusive sampling kits are designed for DIY use, require no equipment, and provide defensible results suitable for property management, tenant–landlord communication, and insurance documentation.
If you are investigating sewage smells or unexplained odours in a residential property, LCS Laboratory can supply the sampling devices and perform the analysis. ©
