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Brighton City of

Water Supply, Brighton, Colorado. NPDES permit CO0046728 expired Apr 30, 2021; its limits still apply. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values), form Q quarterly (2 values), form W quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 2 required values missing, 0 of 20 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum value79.68 %≥ 100 %20%
March 2026LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum value71.7 %≥ 100 %28%
June 2026LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum value62.61 %≥ 100 %37%

Limits in force (48)

ParameterStatisticLimitMonths
Conductivity30-day averagereport only (dS/m)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Bicarbonate ion- [as HCO3]30-day averagereport only (mg/L)all year
Bicarbonate ion- [as HCO3]daily maximumreport only (mg/L)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year
Nitrogen, inorganic totalaggregate rolling medianreport only (mg/L)all year
Nitrogen, inorganic total95th percentilereport only (mg/L)all year
Phosphorus, total [as P]aggregate rolling medianreport only (mg/L)all year
Phosphorus, total [as P]95th percentilereport only (mg/L)all year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Calcium, total recoverable30-day averagereport only (mg/L)all year
Calcium, total recoverabledaily maximumreport only (mg/L)all year
Magnesium, total recoverable30-day averagereport only (mg/L)all year
Magnesium, total recoverabledaily maximumreport only (mg/L)all year
Sodium, total recoverable30-day averagereport only (mg/L)all year
Sodium, total recoverabledaily maximumreport only (mg/L)all year
Sodium adsorption ratio30-day averagereport only (Ratio)all year
Sodium adsorption ratiodaily maximumreport only (Ratio)all year
Sodium adsorption ratio30-day averagereport only (Ratio)all year
Sodium adsorption ratiodaily maximumreport only (Ratio)all year
Chloride [as Cl]30-day averagereport only (mg/L)all year
Arsenic, total recoverable30-day averagereport only (ug/L)all year
Molybdenum, total recoverable30-day averagereport only (ug/L)all year
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year
Flow, in conduit or thru treatment plant30-day average≤ 1.7 MGDall year
Flow, in conduit or thru treatment plant30-day average≤ .99 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residual30-day average≤ .051 mg/Lall year
Chlorine, total residual30-day average≤ .058 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .062 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .072 mg/Lall year
Sulfide-hydrogen sulfide [undissociated]30-day averagereport only (mg/L)all year
Sulfide-hydrogen sulfide [undissociated]30-day average≤ .013 mg/Lall year
Sodium Absorption Ratiodaily maximumreport only (Ratio)all year
Sodium Absorption Ratio30-day averagereport only (pass=0;fail=1)all year
Sodium Absorption Ratio30-day averagereport only (Ratio)all year
Sodium Absorption Ratiodaily maximumreport only (Ratio)all year
Mercury, total [as Hg]30-day averagereport only (mg/L)all year
Sulfate30-day average≤ 1700 mg/Lall year
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaminimum value≥ 100 %all year
LC50 Static Renewal 96Hr Acute Pimephales promelasminimum value≥ 100 %all year

How strict are these limits?

Cited limits by parameter: Colorado's rules and the federal ones.

Same industry: the 13 Water Supply permits in Colorado.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CO0046728 · MCP: https://passage-data.com/mcp