Drinking water quality · 2023
· Verified
What's in Three Valleys MWD — Claremont, Ca, CA tap water
61 contaminants were measured in the Three Valleys MWD — Claremont, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 61
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 12–45 ug/LReported levelColumn 3 | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 0–23 ug/LReported levelColumn 3 | None set | Within the limit |
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 2 ug/LReported levelColumn 3 | None set | Within the limit |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected ug/LReported levelColumn 5 | None set | None detected |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.34 NTUReported levelMiramar Groundwater Well #1 | None set | Within the limit |
+By source (6)— Miramar Groundwater Well #1, Miramar Groundwater Grand Well, Miramar Groundwater Miragrand Well +3 more
| |||
| ColorA measure of visible tint in the water. | 1Reported levelColumn 3 | None set | Detected — no federal limit |
| OdorA measure of detectable smell in the water. | 1Reported levelColumn 6 | None set | Detected — no federal limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 912–996Reported levelColumn 3 | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.4 mg/LReported levelColumn 3 | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 506–587 mg/LReported levelMetropolitan Water District | None set | Detected — no federal limit |
+By source (2)— Metropolitan Water District, Three Valleys MWD
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.82 pCi/LReported levelColumn 8 | 0.05 pCi/LPublic health goal | Within the limit |
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | Not detected pCi/LReported levelColumn 3 | 15 pCi/LMCL | None detected |
| RadonA naturally occurring radioactive gas that can dissolve into groundwater. | Not detected pCi/LReported levelMetropolitan Water District | None set | None detected |
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 0–5 pCi/LReported levelColumn 3 | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 3.4 pCi/LReported levelColumn 8 | 20 pCi/LMCL | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | Not detected mg/LReported levelColumn 7 | None set | None detected |
| IronA naturally occurring metal common in groundwater. | Not detected ug/LReported levelColumn 5 | None set | None detected |
| ManganeseA naturally occurring metal from soil and rock. | Not detected ug/LReported levelColumn 5 | None set | None detected |
| SeleniumA trace element from natural deposits and industrial discharge. | Not detected ug/LReported levelColumn 7 | None set | None detected |
| Strontium | Not detected pCi/LReported levelColumn 3 | None set | None detected |
| Thallium | Not detected ug/LReported levelColumn 7 | None set | None detected |
| AluminumA common element sometimes used as a treatment coagulant. | 0–150 ug/LReported levelColumn 3 | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Cryptosporidium | Not detectedReported levelMiramar Groundwater Grand Well | None set | None detected |
+By source (6)— Miramar Groundwater Grand Well, Weymouth Effluent, Miramar Groundwater Miragrand Well +3 more
| |||
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Reported levelMiramar Groundwater Well #2 | None set | None detected |
+By source (6)— Miramar Groundwater Well #2, Miramar Effluent, Weymouth Effluent +3 more
| |||
| Giardia lamblia | Not detectedReported levelMiramar Groundwater Miragrand Well | None set | None detected |
+By source (6)— Miramar Groundwater Miragrand Well, Miramar Groundwater Grand Well, Miramar Effluent +3 more
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0–0.1 %Reported levelWeymouth Effluent | None set | Detected — no federal limit |
+By source (6)— Weymouth Effluent, Miramar Groundwater Grand Well, Miramar Groundwater Well #1 +3 more
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Alachlor | Not detected ug/LReported levelMiramar Groundwater Grand Well | None set | None detected |
+By source (6)— Miramar Groundwater Grand Well, Miramar Groundwater Miragrand Well, Miramar Groundwater Well #1 +3 more
| |||
| Carbofuran | Not detected ug/LReported levelMiramar Groundwater Well #2 | None set | None detected |
+By source (6)— Miramar Groundwater Well #2, Weymouth Effluent, Miramar Groundwater Grand Well +3 more
| |||
| Chlordane | Not detected ng/LReported levelWeymouth Effluent | None set | None detected |
+By source (6)— Weymouth Effluent, Miramar Groundwater Well #2, Miramar Groundwater Miragrand Well +3 more
| |||
| Deha | Not detected ug/LReported levelWeymouth Effluent | None set | None detected |
+By source (6)— Weymouth Effluent, Miramar Groundwater Well #2, Miramar Groundwater Grand Well +3 more
| |||
| Dehp | Not detected ug/LReported levelMiramar Groundwater Grand Well | None set | None detected |
+By source (6)— Miramar Groundwater Grand Well, Miramar Effluent, Miramar Groundwater Well #2 +3 more
| |||
| Dichloroethane 12 | Not detected ug/LReported levelColumn 6 | None set | None detected |
| Dichloropropane 12 | Not detected ug/LReported levelColumn 6 | None set | None detected |
| Dinoseb | Not detected ug/LReported levelMiramar Groundwater Well #2 | None set | None detected |
+By source (6)— Miramar Groundwater Well #2, Miramar Effluent, Miramar Groundwater Well #1 +3 more
| |||
| Diquat | Not detected ug/LReported levelColumn 7 | None set | None detected |
| Endothall | Not detected ug/LReported levelColumn 6 | None set | None detected |
| Endrin | Not detected ug/LReported levelColumn 5 | None set | None detected |
| Glyphosate | Not detected ug/LReported levelColumn 5 | None set | None detected |
| Heptachlor | Not detected ng/LReported levelColumn 5 | None set | None detected |
| Heptachlor Epoxide | Not detected ng/LReported levelColumn 3 | None set | None detected |
| Hexachlorobenzene | Not detected ug/LReported levelColumn 4 | None set | None detected |
| Hexachlorocyclopentadiene | Not detected ug/LReported levelColumn 6 | None set | None detected |
| Lindane | Not detected ng/LReported levelColumn 6 | None set | None detected |
| Methoxychlor | Not detected ug/LReported levelColumn 7 | None set | None detected |
| Oxamyl | Not detected ug/LReported levelColumn 3 | None set | None detected |
| Pcb Total | Not detected ng/LReported levelColumn 5 | None set | None detected |
| Pentachlorophenol | Not detected ug/LReported levelColumn 4 | None set | None detected |
| Picloram | Not detected ug/LReported levelColumn 7 | None set | None detected |
| Toxaphene | Not detected ug/LReported levelColumn 5 | None set | None detected |
| Trichlorobenzene 124 | Not detected ug/LReported levelColumn 5 | None set | None detected |
| Twofourd | Not detected ug/LReported levelMiramar Groundwater Well #2 | None set | None detected |
+By source (6)— Miramar Groundwater Well #2, Miramar Effluent, Miramar Groundwater Miragrand Well +3 more
| |||
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected ng/LReported levelMiramar Groundwater Grand Well | None set | None detected |
+By source (6)— Miramar Groundwater Grand Well, Miramar Groundwater Well #2, Miramar Groundwater Well #1 +3 more
| |||
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | Not detected ug/LReported levelMiramar Groundwater Miragrand Well | None set | None detected |
+By source (6)— Miramar Groundwater Miragrand Well, Miramar Groundwater Well #2, Miramar Groundwater Grand Well +3 more
| |||
| Benzo(a)pyrene | Not detected ng/LReported levelMiramar Effluent | None set | None detected |
+By source (6)— Miramar Effluent, Miramar Groundwater Miragrand Well, Weymouth Effluent +3 more
| |||
| Dalapon | Not detected ug/LReported levelMiramar Groundwater Well #1 | 200 ug/LMCL | None detected |
+By source (6)— Miramar Groundwater Well #1, Weymouth Effluent, Miramar Effluent +3 more
| |||
| DBCP1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide. | Not detected ng/LReported levelMiramar Groundwater Grand Well | None set | None detected |
+By source (6)— Miramar Groundwater Grand Well, Miramar Effluent, Miramar Groundwater Miragrand Well +3 more
| |||
| Ethylene dibromide | Not detected ng/LReported levelColumn 5 | 5000000 ng/LMCL | None detected |
| MTBE | Not detected ug/LReported levelColumn 4 | None set | None detected |
| Simazine | Not detected ug/LReported levelColumn 8 | None set | None detected |
Inorganic chemicals
Source: Three Valleys MWD — Claremont, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Three Valleys MWD — Claremont, Ca, CA's water
+Is Three Valleys MWD — Claremont, Ca, CA tap water safe to drink in 2023?
Every one of the 61 contaminants measured in Three Valleys MWD — Claremont, Ca, CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Three Valleys MWD — Claremont, Ca, CA tap water?
61 contaminants were measured in Three Valleys MWD — Claremont, Ca, CA's 2023 Consumer Confidence Report, spanning other, vocs & pesticides, and metals. 5 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Three Valleys MWD — Claremont, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Three Valleys MWD — Claremont, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.
More water systems in CA
Gswc - Claremont — San Dimas, CaGswc - Claremont — San Dimas, CaGswc - Claremont — San Dimas, CaGswc - Claremont — San Dimas, CaMonte Vista Wd — Montclair, CaLa Verne, City Wd — La Verne, CaLa Verne, City Wd — La Verne, CaLa Verne, City Wd — La Verne, CaLa Verne, City Wd — La Verne, CaCalif State Polytechnical Univ - Pomona — Pomona, CaCalif State Polytechnical Univ - Pomona — Pomona, CaCalif State Polytechnical Univ - Pomona — Pomona, CaCalif State Polytechnical Univ - Pomona — Pomona, CaPomonaPomona - City, Water Dept.Pomona - City, Water Dept.Pomona - City, Water Dept.San Antonio Water Company — Upland, CaUpland, City of — Upland, CaSunny Slope Water Co. — Pasadena, CaSunny Slope Water Co. — Pasadena, CaOntarioOntario Municipal Utilities CompanyOntario Municipal Utilities CompanyAll water systems →