Reading Customer Water Quality Reference
Why this matters
Water quality affects everything water touches - fixtures, appliances, water heaters, plumbing, even taste. The tech who can identify water quality issues recommends appropriate treatment + extends equipment life. This is the field card.
Water sources
Municipal water:
- Treated by utility
- Generally safe to drink
- Contains chlorine OR chloramine (disinfectant)
- Quality varies by source + treatment
Private well:
- Customer responsibility
- Untreated typically
- Quality varies wildly
- Annual testing recommended
Surface water (rural):
- Cisterns, springs
- Highly variable
- Treatment usually required
Common water quality issues
Hard water:
- High calcium + magnesium
- Most common issue
- Scale buildup
- Soap won't lather
- Spots on dishes
Acidic water (low pH):
- pH below 7
- Corrodes pipes (especially copper)
- Blue / green staining (copper corrosion)
- Pinhole leaks over time
- Common in well water
Iron:
- Reddish / brown staining
- Metallic taste
- Stains fixtures + laundry
- Can be in solution OR particulate
Manganese:
- Black staining
- Often with iron
- Similar treatment
Sulfur:
- Rotten egg smell
- Anaerobic bacteria OR mineral
- Hot water specific (water heater) sometimes
- Treatment: aeration + chlorination, OR replace anode rod
Sediment:
- Sand, silt, rust
- Clogs aerators, valves
- Filter at point of entry
Bacteria:
- Coliform contamination (well water)
- Health risk
- Chlorination + testing
Chlorine taste:
- Municipal disinfectant
- Sometimes excessive
- Carbon filtration removes
Nitrates:
- Agricultural areas
- Health concern (especially infants)
- Reverse osmosis OR ion exchange
Lead:
- Old plumbing OR service lines
- Health concern
- Lead-specific filtration OR replacement
Visual indicators
Hard water signs:
- Scale on faucets
- Soap scum
- Spots on dishes
- White buildup in coffee maker
- Reduced flow at fixtures (scale)
Acidic water signs:
- Blue / green stains in sinks
- Pinhole leaks in copper
- Stained fixtures (blue rings)
Iron signs:
- Reddish stains in toilet bowl
- Orange-stained laundry
- Metallic taste
- Cloudy water (when first drawn)
Sulfur signs:
- Rotten egg smell
- Only hot water (water heater issue) OR all water (well)
Sediment signs:
- Water cloudy when first drawn
- Particles in aerator
- Clogged filters
Testing water
Test strips (simple):
- Hardness (grains per gallon)
- pH
- Iron
- Chlorine
- Cheap; rough indication
Digital testers:
- TDS (total dissolved solids)
- pH
- Conductivity
- Better accuracy
Lab tests:
- Comprehensive analysis
- Required for some issues (bacteria, lead, nitrates)
- Customer mails sample
- Annual recommended for well
Hardness scale
Grains per gallon (gpg):
- 0-1 gpg: soft
- 1-3.5 gpg: slightly hard
- 3.5-7 gpg: moderately hard
- 7-10.5 gpg: hard
- 10.5+ gpg: very hard
Most US tap water: 3-10+ gpg.
Effects by hardness:
- Soft: no scale; some don't like taste; can be corrosive to old galvanized
- Slightly hard: minor scale
- Hard: significant scale; appliance impact; soap issues
- Very hard: severe issues; treatment recommended
Water softeners
Ion exchange softener:
- Sodium replaces calcium / magnesium
- Most common
- Salt added regularly
- Regenerates periodically
Components:
- Resin tank (does the softening)
- Brine tank (salt + water)
- Control valve (regeneration cycles)
- Bypass valve
Sizing:
- Per home size + hardness + water use
- Match grain capacity to weekly use × hardness
Maintenance:
- Salt added monthly
- Resin lasts 10-20 years
- Settings periodic verification
Customer benefits:
- Less scale on fixtures + appliances
- Soap works better
- Longer water heater life
- Softer skin / hair (some prefer)
Drawbacks:
- Sodium in water (concern for some)
- Salt consumption
- Initial cost
Acid neutralization
For acidic well water:
Calcite neutralizer:
- Mineral filter
- Calcium carbonate dissolves into water
- Raises pH
- Requires periodic media replenishment
Soda ash injection:
- For very acidic
- Pump injects solution
- More precise control
- More complex
Iron removal
Iron filter:
- Birm OR manganese greensand
- Oxidizes + filters iron
- Regenerates
- For most iron levels
Aeration:
- Air injection oxidizes iron
- Settles out
- For high iron
Sequestration:
- Polyphosphate keeps iron in solution
- Prevents staining
- Doesn't remove iron
- For low iron
Bacteria treatment
Chlorination:
- Inject chlorine continuously OR shock-treat
- Kills bacteria
- Carbon filter downstream removes chlorine taste
UV sterilization:
- UV light kills bacteria
- No chemicals
- Bulb replacement annually
- Doesn't address other contaminants
Reverse osmosis (point-of-use):
- Removes most contaminants
- Drinking water only typically
- Wastewater (3-4× treated water)
Comprehensive systems
For multiple issues:
- Sediment filter (first)
- Water softener
- Acid neutralizer (if needed)
- Iron filter (if needed)
- UV (if bacteria)
- Carbon (taste)
- Reverse osmosis (drinking)
Sized + sequenced based on water test.
Equipment damage from water quality
Water heater:
- Hard water: scale on bottom + element
- Reduced efficiency
- Premature failure
- Anode rod consumed faster
Dishwasher:
- Spots on dishes
- Scale buildup in spray arms
- Reduced cleaning efficiency
Coffee maker / ice maker:
- Mineral buildup
- Reduced flow
- Need descaling
Plumbing:
- Acidic water: pinhole leaks in copper
- Hard water: reduced flow at faucets (aerator clog)
HVAC humidifier:
- Mineral buildup on pad
- Frequent maintenance needed
Customer education
When you identify water quality issue:
"Your water hardness is [X] grains per gallon. That's [moderate / hard / very hard]. Here's what that means..."
Explain:
- Effects on equipment + fixtures
- Cost of doing nothing
- Treatment options + cost
- Customer's choice
Cross-trade observations
Plumber: stains on fixtures; corroded pipes; failed appliances HVAC tech: humidifier scale; tankless heat exchanger fouling Appliance repair: scaled water heaters + dishwashers Pool service: water chemistry related
Testing approach
For service call:
- Hardness test strip (30 seconds)
- pH test (30 seconds)
- Chlorine / chloramine (municipal)
- Visual inspection of fixtures + appliances
- Customer interview (taste, smell, staining experienced)
Based on findings: recommendation OR full lab test.
When to recommend lab test
- Well water (annually anyway)
- New construction
- Suspected contamination
- Customer health issue
- Property purchase (sometimes)
Common water-quality mistakes
References
- NSF International standards
- AWWA water quality recommendations
- EPA drinking water standards
- WQA (Water Quality Association)
- Manuall internal: Water Filtration Systems, Hot Water System Diagnosis