Drinking water quality · 2023
· Verified
· PWSID CA1910041
What's in Three Valleys MWD — Claremont, Ca, CA tap water
Every one of the 11 core regulated contaminants reported for Three Valleys MWD — Claremont, Ca, CA came in below its federal limit.
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −13 core regulated contaminants never reported (11/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →+62 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| TTHM | 39.1–48.5 ug/L | 80 ug/L |
| HAA5 | 0–23 ug/L | 60 ug/L |
| Turbidity | 0.34 NTU | 1 NTU |
| Bromate | 2 ug/L | 10 ug/L |
| Combined Radium | 0.82 pCi/L | 5 pCi/L |
| Perchlorate | Not detected ug/L | — |
| Chloride | 96–116 mg/L | — |
| Sulfate | 200–250 mg/L | — |
| Aluminum | 0–150 ug/L | — |
| Copper | Not detected mg/L | 1.3 mg/L |
| Iron | Not detected ug/L | — |
| Manganese | Not detected ug/L | — |
| Selenium | Not detected ug/L | 50 ug/L |
| Strontium | Not detected pCi/L | — |
| Thallium | Not detected ug/L | 2 ug/L |
| Cryptosporidium | Not detected | — |
| Escherichia coli (E. coli) | 0 % | — |
| Giardia lamblia | Not detected | — |
| Total Coliform | 0–0.3 % | — |
| Alachlor | Not detected ug/L | 2 ug/L |
| Carbofuran | Not detected ug/L | 40 ug/L |
| Chlordane | Not detected ng/L | 2000 ng/L |
| Deha | Not detected ug/L | 400 ug/L |
| Dehp | Not detected ug/L | 6 ug/L |
| Dichloroethane 12 | Not detected ug/L | 5 ug/L |
| Dichloropropane 12 | Not detected ug/L | 5 ug/L |
| Dinoseb | Not detected ug/L | 7 ug/L |
| Diquat | Not detected ug/L | 20 ug/L |
| Endothall | Not detected ug/L | 100 ug/L |
| Endrin | Not detected ug/L | 2 ug/L |
| Glyphosate | Not detected ug/L | 700 ug/L |
| Heptachlor | Not detected ng/L | 400 ng/L |
| Heptachlor Epoxide | Not detected ng/L | 200 ng/L |
| Hexachlorobenzene | Not detected ug/L | 1 ug/L |
| Hexachlorocyclopentadiene | Not detected ug/L | 50 ug/L |
| Lindane | Not detected ng/L | 200 ng/L |
| Methoxychlor | Not detected ug/L | 40 ug/L |
| Oxamyl | Not detected ug/L | 200 ug/L |
| Pcb Total | Not detected ng/L | 500 ng/L |
| Pentachlorophenol | Not detected ug/L | 1 ug/L |
| Picloram | Not detected ug/L | 500 ug/L |
| Radium 226 228 | Not detected pCi/L | 5 pCi/L |
| Toxaphene | Not detected ug/L | 3 ug/L |
| Trichlorobenzene 124 | Not detected ug/L | 70 ug/L |
| Twofourd | Not detected ug/L | 70 ug/L |
| Color | 1 | — |
| Odor | 1 | — |
| Specific Conductance | 912–1080 | — |
| TOC | 2.4 mg/L | — |
| Total Dissolved Solids | 506–680 mg/L | — |
| Gross Alpha | Not detected pCi/L | 15 pCi/L |
| Gross Beta Particle Activity | 0–5 pCi/L | — |
| Radon | Not detected pCi/L | — |
| Uranium | 3.4 pCi/L | 20 pCi/L |
| 1,2,3-TCP | Not detected ng/L | — |
| Atrazine | Not detected ug/L | 3 ug/L |
| Benzo(a)pyrene | Not detected ng/L | 200 ng/L |
| Dalapon | Not detected ug/L | 200 ug/L |
| DBCP | Not detected ng/L | 200 ng/L |
| Ethylene dibromide | Not detected ng/L | 5000000 ng/L |
| MTBE | Not detected ug/L | — |
| Simazine | Not detected ug/L | 4 ug/L |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in Three Valleys MWD — Claremont, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.