Why Indore's Water Gets Worse in Monsoon — and How Your RO Handles It
Every year in Indore, the monsoon brings relief from the heat — but it also brings a sharp rise in waterborne illness. Hospitals see a surge in cases of gastroenteritis, typhoid, and diarrhoea between July and September. The cause is almost always contaminated drinking water.
If you have an RO purifier, you're in a much better position — but monsoon puts extra stress on your purifier's filters. This guide explains exactly what happens to Indore's water during monsoon and what your RO needs to cope with it.
⚠️ Monsoon Is Indore's Highest-Risk Water Period
Heavy rain causes runoff from farms, roads, and open drains into water sources. Narmada flow increases dramatically, carrying more sediment, organic matter, and agricultural chemicals. Underground pipe pressure drops during heavy rain, allowing contaminants to seep in through micro-cracks. This is why waterborne disease peaks between July–September in Indore every year.
What Happens to Indore's Water During Monsoon?
| Water Quality Factor | Normal Season | Monsoon Season |
|---|---|---|
| Turbidity (cloudiness) | Low — clear water | High — sediment, silt from runoff |
| TDS | 300–450 mg/L (Narmada) | Often lower — diluted by rain, but more organics |
| Bacterial load | Moderate | High — faecal coliform from runoff |
| Chlorine (municipal dosing) | Standard | Increased — municipalities add extra chlorine in monsoon |
| Pesticide / chemical traces | Low | Higher — agricultural runoff |
| Pipe contamination risk | Low | Higher — pressure drops allow infiltration |
How Monsoon Affects Your RO Purifier
1. Sediment Filter Clogs Faster
The sediment filter (first stage) catches silt, sand, rust, and suspended particles. During monsoon, input water turbidity can be 3–5x higher than normal. A filter that lasts 4 months normally may clog in 6–8 weeks during monsoon.
Sign: Noticeably reduced water flow from the tap. Fix: Replace the sediment filter — it costs ₹80–₹150 and takes 5 minutes.
2. Pre-Carbon Filter Works Harder
Municipalities increase chlorine dosing during monsoon to fight bacterial contamination. More chlorine in the input water means the pre-carbon filter — which absorbs chlorine — saturates more quickly.
Sign: Slight chlorine smell in output water. Fix: Replace pre-carbon filter (₹150–₹250).
3. Bacterial Load on the Membrane Increases
Higher bacterial load in source water during monsoon means the RO membrane and UV stage (if fitted) handle more microorganisms. A well-functioning membrane rejects bacteria completely. However, if your membrane is old (18+ months) or the UV lamp has failed, monsoon is when contamination risk is highest.
4. Storage Tank Risk
If power cuts are frequent (common during Indore monsoon storms), your RO stops purifying but the tap may still dispense stored water. If the tank hasn't been cleaned recently, this water can carry bacterial contamination from within the tank. Tank sanitisation before monsoon is strongly recommended.
📋 Pre-Monsoon RO Checklist (June)
- ✅ Replace sediment filter if it's 3+ months old
- ✅ Replace pre-carbon filter if it's 4+ months old
- ✅ Check and clean the storage tank
- ✅ Test the UV lamp if your RO has one — replace if it's 12+ months old
- ✅ Check the RO membrane TDS rejection — if below 85%, it's time to replace
- ✅ Check all pipe connections for leaks that rain and humidity may worsen
During Monsoon — Monthly Check
Once monsoon starts, do a simple check every 4–6 weeks:
- Flow rate: Is water coming at a normal speed from the RO tap? Reduced flow = clogged sediment filter
- Colour: Output water should be crystal clear. Any tinge = sediment filter issue, replace immediately
- TDS: Check with a TDS meter. Should be 80–150 mg/L. If it's risen significantly, membrane may need testing
- Smell: Any chlorine or earthy smell = pre-carbon filter needs changing
Post-Monsoon Care (October)
After monsoon ends, do a thorough service:
- Replace all filters that were changed at the start of monsoon (3–4 months old by now)
- Sanitise the storage tank — bacterial biofilm may have built up during the humid monsoon months
- Check the RO membrane rejection rate — monsoon turbidity puts extra strain on it
- Test output TDS and recalibrate the TDS controller if needed
💡 Monsoon AMC is the Smartest Investment
If you're on an Aqua Care RO AMC plan, monsoon servicing is covered. We schedule a pre-monsoon service in June and a post-monsoon check in October — ensuring your purifier handles the season without you having to track filter ages or call for emergency service. AMC plans start at ₹999/year.
What If You Don't Have an RO?
During monsoon in Indore, the risk of drinking unfiltered tap water is significant. If you don't yet have an RO purifier:
- Boil all drinking water for at least 1 minute before consumption
- Do not use refrigerated "cooled boiled water" stored for more than 24 hours — bacterial growth resumes once cool
- Consider installing an RO before the next monsoon — installation takes less than 2 hours