Hhw&P Moccasin Compound - SFPUC
What EPA’s and California’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 410 people
- Connections
- 89
- Water source
- Surface water bought from another system
- Based in
- Burlingame, CA
- County
- San Francisco
- Owner
- Local government
- Hardness
- Soft
The ZIP code it serves
The short answer
1 result is above EPA’s legal limit. The worst: Haloacetic acids (HAA5), above the legal limit. 3 health-based violations since 2016.
What was found
Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.6 ppm, for the period ending Dec. 31, 2003. None since is on file, so it is not counted as a current finding.
Haloacetic acids (HAA5), total trihalomethanes (TTHM), arsenic, chromium (total), fluoride and nitrate: California’s own results, samples taken from Feb. 11, 2020 to May 12, 2026.
Above the legal limit1
Haloacetic acids (HAA5)
Forms or is added in treatment
60.3ppb
Highest yearly average, 2020 to 2026
2026 average: 47.6 ppb
Averaged by year, the highest was 60.3 ppb, in 2023, which EPA rounds to 60 ppb to compare: at its legal limit of 60 ppb, not above it. Its highest single sample was 110 ppb. In 2026, the latest year on file, its four samples averaged 47.6 ppb. EPA judges this limit at each sampling point, and recorded a violation for haloacetic acids (HAA5) at this utility in 2023.
What handles it
No certification claim covers this compound yet.
Below EPA’s limits1
Total trihalomethanes (TTHM)
Forms or is added in treatment
72.2ppb
Highest yearly average, 2020 to 2026
Averaged by year, the highest was 72.2 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 101 ppb. That was also the latest year on file. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Fluoride
- Lead
- Nitrate
Hardness
Soft, 3.2 mg/L (0.2 grains per gallon), at its one sampling point, 2019 to 2025.
Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Total Haloacetic Acids (HAA5) | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | July 1, 2023 to Sept. 30, 2023 | 0.065 MG/L | Resolved |
| Total Haloacetic Acids (HAA5) | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | April 1, 2023 to June 30, 2023 | 0.068 MG/L | Resolved |
| Total Haloacetic Acids (HAA5) | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2023 to March 31, 2023 | 0.061 MG/L | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. | ||||
What this report can’t tell you
Everything else. Haloacetic acids (HAA5), total trihalomethanes (TTHM), arsenic, chromium (total), fluoride and nitrate results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Hhw&P Moccasin Compound - SFPUC’s own annual report, which it must send you every year, has the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; California’s results run from Feb. 11, 2020 to May 12, 2026.
Testing your own tap
The 3 labs California certifies closest to the area Hhw&P Moccasin Compound - SFPUC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Precision Enviro-Tech
Twain Harte, CA · about 17 miles
Certified for bacteria
Microbac Laboratories, Inc. - Turlock
Turlock, CA · about 39 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity
Certified Laboratories - Turlock
Turlock, CA · about 40 miles
Certified for bacteria
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- California State Water Resources Control Board, Division of Drinking Water, results from Jan. 1, 2020 to July 17, 2026, read Oct. 8, 2026
- Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation, read Oct. 17, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: California State Water Resources Control Board, Division of Drinking Water, results from June 18, 2019 to June 24, 2025, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CA3810003. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on Haloacetic acids (HAA5)What each one does to health, where it comes from, and the certification claim that addresses it.About Haloacetic acids (HAA5)
- Get the utility’s own reportHhw&P Moccasin Compound - SFPUC must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded