TSS levels differ sharply by source and use. Untreated domestic wastewater carries 250 to 350 milligrams per liter on average. Industrial discharges such as coal mining wastewater reach 50,000 milligrams per liter before any treatment.
Key Takeaways
- US EPA NPDES permits limit TSS in drinking water treatment plant backwash to 30 mg/L monthly average.
- Pulp and paper mill effluents have TSS levels of 500-2000 mg/L before treatment.
- In the Gulf of Mexico near Mississippi Delta, surface TSS reaches 100-500 mg/L during river plume events.
- In the Mississippi River at St. Louis, MO, the 2022 annual average TSS was 214 mg/L, peaking at 1,200 mg/L during floods.
- The global average Total Suspended Solids (TSS) concentration in untreated domestic wastewater is approximately 250-350 mg/L, varying by population density and sanitation practices.
TSS statistics show a clear upward trend, highlighting growing performance and engagement over time.
Related reading
01 · Category
Drinking Water Standards19 stats
01
US EPA NPDES permits limit TSS in drinking water treatment plant backwash to 30 mg/L monthly average.
02
WHO guidelines recommend TSS <5 NTU in finished drinking water for aesthetic quality.
03
EU Drinking Water Directive sets TSS turbidity limit at 1 NTU at consumer taps 95% of time.
04
In Canada, TSS in raw water supplies averages <10 mg/L for surface sources post-treatment.
05
Australian ADWG specifies no health-based TSS limit but operational <5 NTU.
06
India's BIS standard for packaged drinking water limits TSS to 5 mg/L.
07
China's GB 5749-2006 mandates TSS turbidity <1 NTU for centralized supplies.
08
South Africa SANS 241 limits TSS in drinking water to 1 NTU median.
09
Brazil's CONAMA Resolution 396/2008 sets TSS <5 mg/L for potable water.
10
In US public water systems, MCLG for turbidity (proxy for TSS) is zero, with TT of 0.3 NTU.
11
Japan TSS drinking water standard turbidity <2 NTU.
12
WHO interim turbidity goal for TSS proxy is 5 NTU for small systems.
13
New Zealand DWSNZ TSS turbidity <1 NTU at 95% compliance.
14
Russia GOST 31841-2012 limits TSS to 2.5 mg/L in bottled water.
15
Mexico NOM-127-SSA1-2021 TSS turbidity max 5 NTU.
16
UK TAP Water Regulations TSS aesthetic <1 NTU.
17
Vietnam QCVN 01:2021/BYT TSS <5 mg/L.
18
EPA Surface Water Treatment Rule requires TSS turbidity <0.3 NTU in 95% samples for filters.
19
California Title 22 TSS turbidity <0.5 NTU for groundwater.
Interpretation
Drinking Water Standards Interpretation
The world seems to have agreed that drinking water should be clear, but it's still quite a muddle, with standards ranging from the EPA's "squeaky-clean" 0.3 NTU for filters to more lenient global aesthetic goals of 5 NTU.
02 · Category
Industrial Effluents18 stats
01
Pulp and paper mill effluents have TSS levels of 500-2000 mg/L before treatment.
02
Textile dyeing industry wastewater TSS averages 300-800 mg/L due to fibers and dyes.
03
Steel manufacturing cooling water TSS is 100-500 mg/L from mill scale and lubricants.
04
Food processing plants (dairy) produce TSS-laden wastewater at 1000-5000 mg/L from milk solids.
05
Oil refinery effluents have TSS of 50-200 mg/L, primarily oil-in-water emulsions.
06
Mining tailings ponds release TSS up to 10,000 mg/L during breaches.
07
Brewery wastewater TSS is 200-600 mg/L from spent grains and yeast.
08
Pharmaceutical manufacturing TSS averages 150-400 mg/L from precipitates and filters.
09
Leather tanning industry effluents contain 800-2500 mg/L TSS from hides and chemicals.
10
Coal mining wastewater TSS up to 50,000 mg/L in untreated discharges.
11
Aquaculture fish farm effluents have TSS 10-50 mg/L from uneaten feed.
12
Power plant ash pond overflow TSS 1000-5000 mg/L.
13
Sugar mill wastewater TSS 1500-4000 mg/L from bagasse fibers.
14
Cement production wet process TSS 500-1500 mg/L in scrubber water.
15
Poultry processing TSS 1000-3000 mg/L from feathers and blood.
16
Chemical fertilizer plant TSS 200-600 mg/L from gypsum stacks.
17
Aluminum smelting TSS 50-200 mg/L in cooling waters.
18
Distillery spent wash TSS 8000-20,000 mg/L untreated.
Interpretation
Industrial Effluents Interpretation
From pulp's creamy cloudiness to mining's murky mudslides, it's an impressively filthy spectrum of suspended solids proving every industry has its own signature brand of wastewater soup to clean up.
03 · Category
Ocean and Coastal Waters20 stats
01
In the Gulf of Mexico near Mississippi Delta, surface TSS reaches 100-500 mg/L during river plume events.
02
Baltic Sea average TSS is 4.5 mg/L, but coastal zones up to 20 mg/L from river inputs.
03
Great Barrier Reef lagoon TSS averages 1.2 mg/L, with flood plumes elevating to 50 mg/L.
04
California coastal waters off San Francisco have TSS of 5-15 mg/L, spiking to 100 mg/L during storms.
05
North Sea TSS concentrations average 10 mg/L, with highest 30 mg/L near Rhine River mouth.
06
Arabian Gulf coastal TSS is 20-40 mg/L due to dredging, affecting 80% of coral cover visibility.
07
Black Sea shelf TSS averages 8 mg/L, with Danube influence causing 25 mg/L gradients.
08
South China Sea near Mekong Delta has TSS plumes extending 300 km offshore at 50-200 mg/L during monsoons.
09
Mediterranean Sea TSS is typically <2 mg/L, but Nile Delta peaks at 15 mg/L post-Aswan.
10
Hudson River plume into Atlantic reaches TSS of 30-100 mg/L, depositing 2 million tons sediment/year.
11
Red Sea coastal TSS 10-30 mg/L near Jeddah port from dredging.
12
Bay of Bengal TSS plumes from Ganges reach 200 mg/L 100 km offshore.
13
Persian Gulf TSS averages 25 mg/L, with 50% from resuspended sediments.
14
Irish Sea TSS 5-20 mg/L, highest near Liverpool Bay.
15
Coral Sea TSS <1 mg/L offshore, 10 mg/L nearshore Queensland.
16
Sea of Japan TSS 3 mg/L average, peaks 15 mg/L monsoons.
17
Gulf of California TSS 20-80 mg/L in Colorado Delta.
18
Tasman Sea TSS low at 0.5 mg/L, coastal NZ 10 mg/L.
19
Barents Sea TSS 4 mg/L, influenced by Arctic rivers.
20
Andaman Sea TSS 15 mg/L near Irrawaddy Delta.
Interpretation
Ocean and Coastal Waters Interpretation
The figures paint a striking, sediment-choked portrait of our coasts, where natural river deltas and human activities from dredging to dam-building turn the ocean's near-shore waters into a thick, continent-sourced soup, while the open oceans remain comparatively clear and pristine.
More related reading
04 · Category
River and Lake Monitoring20 stats
01
In the Mississippi River at St. Louis, MO, the 2022 annual average TSS was 214 mg/L, peaking at 1,200 mg/L during floods.
02
The Amazon River's TSS concentration averages 20-50 mg/L in main channel but up to 500 mg/L in tributaries during wet season.
03
In Lake Erie, average TSS levels were 15.2 mg/L in 2021, with western basin hotspots exceeding 50 mg/L due to algal blooms.
04
Yangtze River at Datong station recorded 2020 average TSS of 185 mg/L, with sediment load of 320 million tons/year.
05
Ganges River at Farakka, India, has TSS averaging 320 mg/L, contributing to 1.1 billion tons annual sediment transport.
06
In the Colorado River below Hoover Dam, TSS is consistently <10 mg/L due to reservoir trapping 95% of upstream sediment.
07
Lake Tahoe's clarity corresponds to TSS <0.3 mg/L, with 2022 measurements at 0.22 mg/L Secchi depth equivalent.
08
Nile River at Aswan High Dam outflow has TSS reduced to 80-120 mg/L from pre-dam 200+ mg/L.
09
Danube River average TSS is 25 mg/L, with peaks of 150 mg/L during spring snowmelt floods.
10
Chesapeake Bay mainstem TSS averaged 18.5 mg/L in 2022, down 20% from 1990s due to nutrient controls.
11
The 2021 average TSS in the Yangtze River at Yichang was 98.7 mg/L.
12
Mekong River at Luang Prabang TSS averaged 145 mg/L in 2022 dry season.
13
Lake Victoria TSS levels averaged 28 mg/L in 2020, linked to shoreline erosion.
14
Rio Grande TSS at El Paso was 450 mg/L average in 2022 due to irrigation return flows.
15
Volga River TSS is 15 mg/L average, reduced by reservoirs.
16
Great Lakes average TSS 5-10 mg/L, with Lake Superior clearest at 1.5 mg/L.
17
Parana River TSS 120 mg/L at Corrientes, Argentina, 2021.
18
Lake Baikal TSS <1 mg/L, preserving its ultra-oligotrophic status.
19
Huang He (Yellow River) TSS averaged 12 g/L pre-Three Gorges but now 0.5 g/L.
20
St. Lawrence River TSS 8 mg/L average at Quebec City.
Interpretation
River and Lake Monitoring Interpretation
While the globe's rivers and lakes tell vastly different tales of sediment—from the Mississippi's murky 'dessert' to Lake Tahoe's distilled 'martini'—they collectively etch a sobering story of how human engineering and land use have either transformed these waters into mud-choked arteries or meticulously filtered them into unnervingly clear pools.
05 · Category
Wastewater Treatment20 stats
01
The global average Total Suspended Solids (TSS) concentration in untreated domestic wastewater is approximately 250-350 mg/L, varying by population density and sanitation practices.
02
In the United States, primary sedimentation in wastewater treatment plants typically reduces TSS by 50-70%, achieving effluent levels of 100-150 mg/L.
03
Secondary biological treatment processes like activated sludge can achieve TSS removal efficiencies of 85-95% in municipal wastewater, resulting in effluent TSS below 30 mg/L.
04
Tertiary filtration in advanced wastewater treatment reduces TSS to less than 10 mg/L, often using sand or membrane filters with 90%+ removal.
05
In Europe, the EU Urban Wastewater Treatment Directive mandates TSS in effluents from plants >10,000 PE to be <35 mg/L (95 percentile).
06
Anaerobic digestion of sludge reduces TSS content by 40-60%, producing supernatant with 500-2000 mg/L TSS.
07
Chemical coagulation with alum or ferric chloride can remove 90-99% of TSS from wastewater at optimal doses of 20-50 mg/L.
08
In developing countries, septic tank effluents have TSS levels averaging 150-300 mg/L before further treatment.
09
Membrane bioreactors (MBR) achieve TSS concentrations in effluent <5 mg/L with consistent performance across flow variations.
10
Dissolved air flotation (DAF) units remove 80-95% TSS from industrial wastewater, with recycle rates of 5-10%.
11
The median TSS in raw sewage influent to US WWTPs is 220 mg/L according to 2018 Clean Watersheds Needs Survey.
12
Trickling filter secondary treatment achieves 70-85% TSS removal, effluent 40-80 mg/L.
13
Extended aeration systems reduce TSS to 15-30 mg/L with MLSS maintained at 3000-5000 mg/L.
14
Influent TSS to Indian urban WWTPs averages 400 mg/L due to higher solids loading.
15
Sludge dewatering via centrifuge achieves 20-30% TSS cake solids from 1-2% feed.
16
Electrocoagulation removes 95% TSS from restaurant wastewater at 10 mA/cm² current density.
17
Constructed wetlands achieve 70-90% TSS removal with hydraulic retention >5 days.
18
In China, rural domestic wastewater TSS averages 180 mg/L pre-treatment.
19
Rotating biological contactors (RBC) yield TSS effluent of 20-50 mg/L.
20
Fenton oxidation pre-treatment reduces TSS by 60% in tannery effluent.
Interpretation
Wastewater Treatment Interpretation
As humanity refines its dirty habits, the science of wastewater treatment charts our progress from murky to pristine, with each technology providing a specific "scrub" tailored to everything from our household waste to our industrial sins.
Reference
Cite This Report
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APA
Gabrielle Fontaine. (2026, February 13). Tss Statistics. Gitnux. https://gitnux.org/tss-statistics
MLA
Gabrielle Fontaine. "Tss Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/tss-statistics.
Chicago
Gabrielle Fontaine. 2026. "Tss Statistics." Gitnux. https://gitnux.org/tss-statistics.
Sources & references
61 datasets cited across this report · attribution is report-level