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Cement, Hydraulic, Boulder County, Colorado. NPDES permit CO0048771 expired Oct 31, 2017; its limits still apply. Last 12 months: no values over a limit, 1 required value missing, 1 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | maximum | report only (SU) | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 005 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 005 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .00009 MGD | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | report only (SU) | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 006 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 006 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year | 006 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 006 |
| Manganese, dissolved [as Mn] | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 006 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Lead, potentially dissolvd | 30-day average | ≤ 37 ug/L | all year | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 006 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .033 MGD | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Mercury, total low level | 30-day average | report only (ug/L) | all year | 006 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 006 |
| Sulfate | 30-day average | report only (mg/L) | all year | 006 |
| Boron, total | 30-day average | report only (mg/L) | all year | 006 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 006 |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 3 Stone, Clay, Glass and Concrete Products permits in Colorado.
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