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Sewage treatment plant, Boulder Creek, California. NPDES permit CA0048267 expired Dec 1, 2016; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | Apr–Oct | 001 |
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | Jan, Feb, Mar, Nov, Dec | 001 |
| Turbidity | 30-day average | ≤ 2 NTU | all year | 001 |
| Turbidity | instantaneous maximum | ≤ 10 NTU | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 15 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 25 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 7.5 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 7.5 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 11.3 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 11.3 lb/d | Apr–Oct | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 8.3 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | Apr–Oct | 001 |
| Solids, total suspended | highest weekly average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | highest weekly average | ≤ 15 mg/L | Apr–Oct | 001 |
| Solids, total suspended | daily maximum | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 25 mg/L | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 7.5 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 7.5 lb/d | Apr–Oct | 001 |
| Solids, total suspended | highest weekly average | ≤ 11.3 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | highest weekly average | ≤ 11.3 lb/d | Apr–Oct | 001 |
| Solids, settleable | daily maximum | ≤ .1 mL/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, settleable | daily maximum | ≤ .1 mL/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, ammonia, tot unionized [as N] | daily maximum | ≤ .025 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia, tot unionized [as N] | daily maximum | ≤ .025 mg/L | Apr–Oct | 001 |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ 7.1 ug/L | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 16 ug/L | all year | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 60 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 120 ug/L | all year | 001 |
| Aluminum, total recoverable | monthly average | ≤ 1000 ug/L | all year | 001 |
| Aluminum, total recoverable | daily maximum | ≤ 2638 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 7.8 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 14 ug/L | all year | 001 |
| Oil and grease | monthly average | ≤ 25 mg/L | all year | 001 |
| Oil and grease | highest weekly average | ≤ 40 mg/L | all year | 001 |
| Oil and grease | daily maximum | ≤ 75 mg/L | all year | 001 |
| Oil and grease | monthly average | ≤ 18.8 lb/d | all year | 001 |
| Oil and grease | highest weekly average | ≤ 30 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Enterococci | monthly average | report only (MPN/100mL) | Apr–Oct | 001 |
| Enterococci | daily maximum | report only (MPN/100mL) | Jan, Feb, Mar, Nov, Dec | 001 |
| Enterococci | daily maximum | report only (MPN/100mL) | Apr–Oct | 001 |
| Mercury, total recoverable | monthly average | ≤ .05 ug/L | all year | 001 |
| Mercury, total recoverable | daily maximum | ≤ .1 ug/L | all year | 001 |
| Coliform, fecal general | monthly average | report only (MPN/100mL) | Apr–Oct | 001 |
| Coliform, fecal general | daily maximum | report only (MPN/100mL) | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, fecal general | daily maximum | report only (MPN/100mL) | Apr–Oct | 001 |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | Apr–Oct | 001 |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | Apr–Oct | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykiss | value | report only (pass=0;fail=1) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | average | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
Cited limits by parameter: California's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CA0048267 · MCP: https://passage-data.com/mcp