Cetronia, PA tap water
Supplied mostly by Swt Main System, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chlorine
Your water is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it.
Safety for fish and shrimp
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2012–2019).
Nitrate (NO₃)
0.8–22 ppm (Worth knowing)
Typical 16 ppm
Water changes can't take your tank's nitrate below this level.
From EPA monitoring data; Lehigh County Authority's 2025 water quality report (2012–2025).
Copper at home taps (first draw)
0.08–0.13 ppm (Low)
The 90th percentile of first-draw samples from homes: water that sat in household pipes for at least six hours.
Low. Water that sits in household pipes overnight can carry more than this.
Published by your utility: Lehigh County Authority's 2025 water quality report.
Chlorine or chloramine at the tap
0.3–1.8 ppm
Typical 1.7 ppm
At tap levels, chlorine and chloramine are toxic to fish, shrimp and the bacteria in a filter. Water conditioners are made for this range.
From EPA monitoring data; Lehigh County Authority's 2025 water quality report (2012–2025).
Water chemistry
General hardness
Supplier's figure180–284 ppm
Typical 257 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From the utility that supplies yours: Lca Allentown Division, which supplies Swt Main System; Lehigh County Authority's 2025 water quality report.
Carbonate hardness (alkalinity)
Supplier's figure70–211 ppm
Typical 173 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From the utility that supplies yours: Lca Allentown Division, which supplies Swt Main System; Lehigh County Authority's 2025 water quality report.
pH
Supplier's figure7.4–8.2
Typical 7.7
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: Lca Allentown Division, which supplies Swt Main System; Lehigh County Authority's 2025 water quality report.
Total dissolved solids
Supplier's figure392–433 ppm
Typical 413 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
From the utility that supplies yours: Lca Allentown Division, which supplies Swt Main System; Lehigh County Authority's 2025 water quality report.
- Swt Main System and Lehigh County Authority add phosphate to protect pipes. It can feed algae in tanks without much plant growth.
Who supplies Cetronia, PA
Swt Main System
Serves 80% of residents · Buys water from Lca Allentown Division · Chlorine
- 2025 water quality report
Lehigh County Authority
Serves 34% of residents · Lake or river water · Chlorine
Our data comes from public records and is still incomplete. Many utilities don't publish every number, so we're adding more all the time. Your city's range is a starting point: testing your own tap is the only way to know exactly what's in it.
Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.
Compiled by Shoal & Stem from public records. Free to cite with a link.