Concept
Water quality
6 studies
Water-quality studies track contaminants, microbes or chemistry in drinking water, wastewater or surface water and what that implies for people or ecosystems.
Water is how many pollutants actually reach households and aquatic life.
Studies
6
Findings
5
7 supporting · 0 challenging · 0 qualifying citations
Open tensions
1
Currently
What we know
- This library holds 6 empirical papers on water quality with measured outcomes rather than reviews.
- Open-science LC-HRMS of 12 sites on four rivers near Dhaka found tens of thousands of chemical features, including urban surfactants, pesticides, and pharmaceuticals, in a rarely monitored South Asian waterscape.
- After Hurricane Florence, 41.2% of tested wells had total coliform and 11.7% E. coli—1.2× and 7.8× routine rates—with higher contamination inside flood boundaries.
- Two Chinese plants dropped MP/NP mass from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent, with nanoplastics removed least.
- In two protected English harbours, CSO discharge days raised mixed chemical burdens 25- to 43-fold above a dry-spring baseline, with imidacloprid exceeding PNEC.
Largest unresolved question
A flood-associated well study or a wastewater reactor is not a national drinking-water standard.
Common misconceptions
If a pathogen is found in water, everyone who drinks it gets sick.
Detection is not the same as a quantified infection risk for a population.
Related
Claim ledger
What the evidence shows
Drawn from 6 studies in this library. Mix labels say which citation roles are present; they are not a strength score. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope.
This library holds 6 empirical papers on water quality with measured outcomes rather than reviews.
- Nontarget LC-HRMS maps Dhaka river pollution
- Flood maps flag contaminated private wells
- WWTPs cut plastic mass but leak nanoplastics
Study Role Design N Population Outcome Nontarget LC-HRMS maps Dhaka river pollution Supports Cross-sectionalOpen-science LC-HRMS nontarget survey of surface waters near Dhaka N=12 · 12 sites on four rivers (Buriganga, Meghna, Shitalakshya, Turag) Surface-water samples from rivers near Dhaka, Bangladesh Nontarget chemical features including surfactants, pesticides, and pharmaceuticals Flood maps flag contaminated private wells Supports Cross-sectionalPost–Hurricane Florence private-well tests overlaid on FEMA/HAND/DFO inundation maps N=754 · 754 well samples after Florence included after exclusions Private wells in FEMA-designated North Carolina counties after Hurricane Florence Total coliform and E. coli positivity inside vs outside flood inundation extents WWTPs cut plastic mass but leak nanoplastics Supports OtherPyrolysis GC/MS mass concentrations of six polymers across WWTP treatment stages N=2 · Two Chinese wastewater treatment plants; size classes 50–1000, 1–50, and 0.01–1 μm Influent and primary/secondary/tertiary effluent of municipal WWTPs MP/NP mass fell from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent; nanoplastics were removed least Open-science LC-HRMS of 12 sites on four rivers near Dhaka found tens of thousands of chemical features, including urban surfactants, pesticides, and pharmaceuticals, in a rarely monitored South Asian waterscape.
After Hurricane Florence, 41.2% of tested wells had total coliform and 11.7% E. coli—1.2× and 7.8× routine rates—with higher contamination inside flood boundaries.
Two Chinese plants dropped MP/NP mass from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent, with nanoplastics removed least.
In two protected English harbours, CSO discharge days raised mixed chemical burdens 25- to 43-fold above a dry-spring baseline, with imidacloprid exceeding PNEC.
Debates
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes.
A flood-associated well study or a wastewater reactor is not a national drinking-water standard.
A flood-associated well study or a wastewater reactor is not a national drinking-water standard.
Study Role Design N Population Outcome Nontarget LC-HRMS maps Dhaka river pollution Supports Cross-sectionalOpen-science LC-HRMS nontarget survey of surface waters near Dhaka N=12 · 12 sites on four rivers (Buriganga, Meghna, Shitalakshya, Turag) Surface-water samples from rivers near Dhaka, Bangladesh Nontarget chemical features including surfactants, pesticides, and pharmaceuticals Flood maps flag contaminated private wells Supports Cross-sectionalPost–Hurricane Florence private-well tests overlaid on FEMA/HAND/DFO inundation maps N=754 · 754 well samples after Florence included after exclusions Private wells in FEMA-designated North Carolina counties after Hurricane Florence Total coliform and E. coli positivity inside vs outside flood inundation extents
PaperFren reads this as a limit on how far one study travels — different assays, populations, or outcomes — not a forced fight between papers.
Timeline
How understanding moved
Study years are when the paper was published. Evidence edits are dated changes to this page's claims. Explanations are when PaperFren added a Discovery — not a claim that the science happened that day.
2026
Concept page published
Water quality
Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Coverage edits are distinct from reviewed research changes and corrections. Dates record PaperFren updates; study publication dates appear in the timeline.
- Coverage updated · Concept page published
Papers
6 studies in this library bear on Water quality, ordered by citations.
- WWTPs cut plastic mass but leak nanoplastics
Two Chinese plants dropped MP/NP mass from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent, with nanoplastics removed least.
- Arsenic injustice in San Joaquin water
Valley water systems serving more people of color were far more likely to violate the arsenic MCL.
- Nontarget LC-HRMS maps Dhaka river pollution
Open-science LC-HRMS of 12 sites on four rivers near Dhaka found tens of thousands of chemical features, including urban surfactants, pesticides, and pharmaceuticals, in a rarely monitored South Asian waterscape.
- Pathogens in Nairobi water and feces
Dog feces carried the most enteric pathogens among hosts sampled in a Nairobi informal area.
- Sewer overflows spike chemicals in marine harbours
In two protected English harbours, CSO discharge days raised mixed chemical burdens 25- to 43-fold above a dry-spring baseline, with imidacloprid exceeding PNEC.
- Flood maps flag contaminated private wells
After Hurricane Florence, 41.2% of tested wells had total coliform and 11.7% E. coli—1.2× and 7.8× routine rates—with higher contamination inside flood boundaries.
Compare studies
Select 2–10 studies. Design and N are labels, not a ranking.
Nothing selected yet.
Questions
What is still open
A flood-associated well study or a wastewater reactor is not a national drinking-water standard.
Ask PaperFren about Water quality
Study this conceptflashcards and short-answer questions
What does water quality mean in this library?
Water-quality studies track contaminants, microbes or chemistry in drinking water, wastewater or surface water and what that implies for people or ecosystems.
Name one empirical finding from the water quality papers.
Open-science LC-HRMS of 12 sites on four rivers near Dhaka found tens of thousands of chemical features, including urban surfactants, pesticides, and pharmaceuticals, in a rarely monitored South Asian waterscape.
What is a limit of water quality evidence here?
A flood-associated well study or a wastewater reactor is not a national drinking-water standard.