U.S. Department of the Interior, National Park Service, Yosemite National Park

NPDES permit CA0081759 · Major FEDERAL · effective, expires 2030-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

1values over a limit
63required values missing, on 5 form(s)
22of 38 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas (1).

Reporting

Reports are due about 32 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (92)

OutfallParameterStatisticLimitMonths
EFF1Temperature, water deg. fahrenheitINST MAX report only all year
EFF1Specific conductanceDAILY MX report only all year
EFF1BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFF1BOD, 5-day, 20 deg. CDAILY MX <= 20 mg/L all year
EFF1pHINST MIN >= 6.5 SU all year
EFF1pHINST MAX <= 8.5 SU all year
EFF1Alkalinity, total [as CaCO3]DAILY MX report only all year
EFF1Solids, total suspendedMO AVG <= 10 mg/L all year
EFF1Solids, total suspendedDAILY MX <= 20 mg/L all year
EFF1Nitrogen, ammonia total [as N]MO AVG <= 3.4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]MO AVG <= 2.8 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 5.8 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF1Nitrogen, ammonia total [as N]WKLY AVG <= 4.8 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF1Nitrogen, nitrite total [as N]DAILY MX report only all year
EFF1Nitrogen, nitrate total [as N]DAILY MX report only all year
EFF1Nitrite + Nitrate total [as N]DAILY MX report only all year
EFF1Phosphorus, total [as P]MO AVG <= .5 mg/L all year
EFF1Phosphorus, total [as P]DAILY MX <= 1 mg/L all year
EFF1Carbon, dissolved organic [as C]DAILY MX report only all year
EFF1Hardness, total [as CaCO3]DAILY MX report only all year
EFF1Calcium, total recoverableDAILY MX report only all year
EFF1Magnesium, total recoverableDAILY MX report only all year
EFF1Sodium, total recoverableDAILY MX report only all year
EFF1Potassium, total recoverableDAILY MX report only all year
EFF1Chloride [as Cl]DAILY MX report only all year
EFF1Iron, total recoverableDAILY MX report only all year
EFF1Boron, total recoverableDAILY MX report only all year
EFF1Zinc, total recoverableMO AVG <= 10 ug/L all year
EFF1Zinc, total recoverableMO AVG <= 326 ug/L all year
EFF1Zinc, total recoverableDAILY MX <= 20 ug/L all year
EFF1Zinc, total recoverableDAILY MX <= 654 ug/L all year
EFF1Aluminum, total recoverableDAILY MX report only all year
EFF1Copper, total recoverableMO AVG <= 2 ug/L all year
EFF1Copper, total recoverableMO AVG <= 62 ug/L all year
EFF1Copper, total recoverableDAILY MX <= 4 ug/L all year
EFF1Copper, total recoverableDAILY MX <= 124 ug/L all year
EFF1Manganese, total recoverableDAILY MX report only all year
EFF1Flow, in conduit or thru treatment plantMO AVG report only all year
EFF1Flow, in conduit or thru treatment plantDAILY MX report only all year
EFF1BOD, 5-day, percent removalMO AV MN >= 90 % all year
EFF1Solids, suspended percent removalMO AV MN >= 90 % all year
EFF1Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFF1Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
EFF2Temperature, water deg. fahrenheitINST MAX report only all year
EFF2Specific conductanceDAILY MX report only all year
EFF2BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
EFF2BOD, 5-day, 20 deg. CDAILY MX <= 20 mg/L all year
EFF2pHINST MIN >= 6.5 SU all year
EFF2pHINST MAX <= 8.5 SU all year
EFF2Alkalinity, total [as CaCO3]DAILY MX report only all year
EFF2Solids, total suspendedMO AVG <= 10 mg/L all year
EFF2Solids, total suspendedDAILY MX <= 20 mg/L all year
EFF2Nitrogen, ammonia total [as N]MO AVG <= 3.4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF2Nitrogen, ammonia total [as N]MO AVG <= 2.8 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF2Nitrogen, ammonia total [as N]WKLY AVG <= 5.8 mg/L Jan, Feb, Mar, Apr, Nov, Dec
EFF2Nitrogen, ammonia total [as N]WKLY AVG <= 4.8 mg/L May, Jun, Jul, Aug, Sep, Oct
EFF2Nitrogen, nitrite total [as N]DAILY MX report only all year
EFF2Nitrogen, nitrate total [as N]DAILY MX report only all year
EFF2Nitrite + Nitrate total [as N]DAILY MX report only all year
EFF2Phosphorus, total [as P]MO AVG <= .5 mg/L all year
EFF2Phosphorus, total [as P]DAILY MX <= 1 mg/L all year
EFF2Carbon, dissolved organic [as C]DAILY MX report only all year
EFF2Hardness, total [as CaCO3]DAILY MX report only all year
EFF2Calcium, total recoverableDAILY MX report only all year
EFF2Magnesium, total recoverableDAILY MX report only all year
EFF2Sodium, total recoverableDAILY MX report only all year
EFF2Potassium, total recoverableDAILY MX report only all year
EFF2Chloride [as Cl]DAILY MX report only all year
EFF2Iron, total recoverableDAILY MX report only all year
EFF2Boron, total recoverableDAILY MX report only all year
EFF2Zinc, total recoverableMO AVG <= 10 ug/L all year
EFF2Zinc, total recoverableDAILY MX <= 20 ug/L all year
EFF2Aluminum, total recoverableDAILY MX report only all year
EFF2Copper, total recoverableMO AVG <= 2 ug/L all year
EFF2Copper, total recoverableDAILY MX <= 4 ug/L all year
EFF2Manganese, total recoverableDAILY MX report only all year
EFF2Flow, in conduit or thru treatment plantMO AVG report only all year
EFF2Flow, in conduit or thru treatment plantDAILY MX report only all year
EFF2BOD, 5-day, percent removalMO AV MN >= 90 % all year
EFF2Solids, suspended percent removalMO AV MN >= 90 % all year
EFF2Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 0 pass=0;fail=1 all year
EFF2Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasMO MED <= 0 pass=0;fail=1 all year
EFF2Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasDAILY MX <= 50 % effect all year
INF1Specific conductanceMO AVG report only all year
INF1Specific conductanceDAILY MX report only all year
INF1BOD, 5-day, 20 deg. CMO AVG report only all year
INF1BOD, 5-day, 20 deg. CDAILY MX report only all year
INF1Solids, total suspendedMO AVG report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states